2022
D. Wellnitz, G. Preisser, V. Alba, J. Dubail, J. Schachenmayer
Rise and fall, and slow rise again, of operator entanglement under dephasing Journal Article
In: Phys. Rev. Lett., 129 , pp. 170401, 2022.
@article{nokey,
title = {Rise and fall, and slow rise again, of operator entanglement under dephasing },
author = {D. Wellnitz, G. Preisser, V. Alba, J. Dubail, J. Schachenmayer},
url = {https://dx.doi.org/10.1103/PhysRevLett.129.170401},
doi = {10.1103/PhysRevLett.129.170401},
year = {2022},
date = {2022-10-21},
urldate = {2022-10-21},
journal = {Phys. Rev. Lett.},
volume = {129},
pages = {170401},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
D. Wellnitz, G. Pupillo, J. Schachenmayer
Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry Journal Article
In: Commun. Phys. 5, 5 , pp. 120, 2022.
@article{nokey,
title = {Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry },
author = {D. Wellnitz, G. Pupillo, J. Schachenmayer},
doi = {10.1038/s42005-022-00892-5},
year = {2022},
date = {2022-05-17},
urldate = {2022-05-17},
journal = {Commun. Phys. 5},
volume = {5},
pages = {120},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
J. Dubail, T. Botzung, J. Schachenmayer, G. Pupillo, D. Hagenmüller
Large Random Arrowhead Matrices: Multifractality, Semi-Localization, and Protected Transport in Disordered Quantum Spins Coupled to a Cavity Journal Article
In: Phys. Rev. A, 105 , pp. 023714, 2022.
@article{nokey,
title = {Large Random Arrowhead Matrices: Multifractality, Semi-Localization, and Protected Transport in Disordered Quantum Spins Coupled to a Cavity },
author = {J. Dubail, T. Botzung, J. Schachenmayer, G. Pupillo, D. Hagenmüller},
doi = {10.1103/PhysRevA.105.023714},
year = {2022},
date = {2022-02-22},
journal = {Phys. Rev. A},
volume = {105},
pages = {023714},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2021
David Wellnitz, Guido Pupillo, Johannes Schachenmayer
A quantum optics approach to photoinduced electron transfer in cavities Journal Article
In: J. Chem. Phys., 154 (054104), 2021.
Links | BibTeX | Tags: Cavity QED, Polaritonic Chemistry, Quantum Optics
@article{wellnitz_quantum_2020,
title = {A quantum optics approach to photoinduced electron transfer in cavities },
author = {David Wellnitz and Guido Pupillo and Johannes Schachenmayer},
url = {https://arxiv.org/abs/2011.06590
https://doi.org/10.1063/5.0037412},
doi = {10.1063/5.0037412},
year = {2021},
date = {2021-02-02},
journal = {J. Chem. Phys.},
volume = {154},
number = {054104},
keywords = {Cavity QED, Polaritonic Chemistry, Quantum Optics},
pubstate = {published},
tppubtype = {article}
}
2020
Andreas Geißler, Guido Pupillo
Mobility edge of the two-dimensional Bose-Hubbard model Journal Article
In: Phys. Rev. Research, 2 , pp. 042037, 2020.
@article{PhysRevResearch.2.042037,
title = {Mobility edge of the two-dimensional Bose-Hubbard model},
author = {Andreas Geiß{}ler and Guido Pupillo},
url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.042037},
doi = {10.1103/PhysRevResearch.2.042037},
year = {2020},
date = {2020-12-01},
journal = {Phys. Rev. Research},
volume = {2},
pages = {042037},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
David Wellnitz, Stefan Schütz, Shannon Whitlock, Johannes Schachenmayer, Guido Pupillo
Collective Dissipative Molecule Formation in a Cavity Journal Article
In: Phys. Rev. Lett., 125 , pp. 193201, 2020.
Links | BibTeX | Tags: Cavity QED, Ultracold chemistry
@article{PhysRevLett.125.193201,
title = {Collective Dissipative Molecule Formation in a Cavity},
author = {David Wellnitz and Stefan Schütz and Shannon Whitlock and Johannes Schachenmayer and Guido Pupillo},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.193201},
doi = {10.1103/PhysRevLett.125.193201},
year = {2020},
date = {2020-11-01},
journal = {Phys. Rev. Lett.},
volume = {125},
pages = {193201},
publisher = {American Physical Society},
keywords = {Cavity QED, Ultracold chemistry},
pubstate = {published},
tppubtype = {article}
}
Thomas Botzung, David Hagenmüller, Stefan Schütz, Jérôme Dubail, Guido Pupillo, Johannes Schachenmayer
Dark state semilocalization of quantum emitters in a cavity Journal Article
In: Phys. Rev. B, 102 , pp. 144202, 2020.
Links | BibTeX | Tags: Cavity QED, dark states, Localization
@article{botzung2020dark,
title = {Dark state semilocalization of quantum emitters in a cavity},
author = {Thomas Botzung and David Hagenmüller and Stefan Schütz and Jérôme Dubail and Guido Pupillo and Johannes Schachenmayer},
url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.144202},
doi = {10.1103/PhysRevB.102.144202},
year = {2020},
date = {2020-10-28},
journal = {Phys. Rev. B},
volume = {102},
pages = {144202},
keywords = {Cavity QED, dark states, Localization},
pubstate = {published},
tppubtype = {article}
}
Araceli Venegas-Gomez, Johannes Schachenmayer, Anton S Buyskikh, Wolfgang Ketterle, Maria Luisa Chiofalo, Andrew J Daley
Adiabatic preparation of entangled, magnetically ordered states with cold bosons in optical lattices Journal Article
In: Quantum Sci. Technol., 5 , pp. 045013, 2020.
Links | BibTeX | Tags: adiabatic state preparation, MPS, Optical lattices
@article{venegasgomez2020adiabatic,
title = {Adiabatic preparation of entangled, magnetically ordered states with cold bosons in optical lattices},
author = {Araceli Venegas-Gomez and Johannes Schachenmayer and Anton S Buyskikh and Wolfgang Ketterle and Maria Luisa Chiofalo and Andrew J Daley},
url = {https://iopscience.iop.org/article/10.1088/2058-9565/abb004},
doi = {10.1088/2058-9565/abb004},
year = {2020},
date = {2020-09-03},
journal = {Quantum Sci. Technol.},
volume = {5},
pages = {045013},
keywords = {adiabatic state preparation, MPS, Optical lattices},
pubstate = {published},
tppubtype = {article}
}
Araceli Venegas-Gomez, Anton S Buyskikh, Johannes Schachenmayer, Wolfgang Ketterle, Andrew J Daley
Dynamics of rotated spin states and magnetic ordering with two-component bosonic atoms in optical lattices Journal Article
In: Phys. Rev. A, 102 , pp. 023321, 2020.
Links | BibTeX | Tags: adiabatic state preparation, MPS, Optical lattices
@article{venegasgomez2019dynamics,
title = {Dynamics of rotated spin states and magnetic ordering with two-component bosonic atoms in optical lattices},
author = {Araceli Venegas-Gomez and Anton S Buyskikh and Johannes Schachenmayer and Wolfgang Ketterle and Andrew J Daley},
url = {https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.023321},
doi = {10.1103/PhysRevA.102.023321},
year = {2020},
date = {2020-08-20},
journal = {Phys. Rev. A},
volume = {102},
pages = {023321},
keywords = {adiabatic state preparation, MPS, Optical lattices},
pubstate = {published},
tppubtype = {article}
}
A. Cidrim, T. S. do Espirito Santo, J. Schachenmayer, R. Kaiser, R. Bachelard
Photon Blockade with Ground-State Neutral Atoms Journal Article
In: Phys. Rev. Lett., 125 , pp. 073601, 2020.
Links | BibTeX | Tags: dipole-dipole interactions, Light scattering, Light-matter interaction, Photon statistics, Subradiance, Superradiance
@article{Cidrim_Photon_2020,
title = {Photon Blockade with Ground-State Neutral Atoms},
author = {A. Cidrim, T. S. do Espirito Santo, J. Schachenmayer, R. Kaiser, R. Bachelard},
url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.125.073601},
doi = {10.1103/PhysRevLett.125.073601},
year = {2020},
date = {2020-08-13},
journal = { Phys. Rev. Lett.},
volume = {125},
pages = {073601},
keywords = {dipole-dipole interactions, Light scattering, Light-matter interaction, Photon statistics, Subradiance, Superradiance},
pubstate = {published},
tppubtype = {article}
}
D. Hagenmüller, S. Schütz, G. Pupillo,, J. Schachenmayer
Adiabatic elimination for ensembles of emitters in cavities with dissipative couplings Journal Article
In: Phys. Rev. A , 102 , pp. 013714, 2020.
Links | BibTeX | Tags: adiabatic elimination, Cavity QED
@article{hagenmuller_adiabatic_2020,
title = {Adiabatic elimination for ensembles of emitters in cavities with dissipative couplings},
author = {D. Hagenmüller, S. Schütz, G. Pupillo, and J. Schachenmayer},
doi = {10.1103/PhysRevA.102.013714},
year = {2020},
date = {2020-07-14},
journal = {Phys. Rev. A },
volume = {102},
pages = {013714},
keywords = {adiabatic elimination, Cavity QED},
pubstate = {published},
tppubtype = {article}
}
M Mizoguchi, Y Zhang, M Kunimi, A Tanaka, S Takeda, N Takei, V Bharti, K Koyasu, T Kishimoto, D Jaksch, A Glaetzle, M Kiffner, G Masella, G Pupillo, M Weidemüller, K Ohmori
Ultrafast Creation of Overlapping Rydberg Electrons in an Atomic BEC and Mott-Insulator Lattice Journal Article
In: Phys. Rev. Lett., 124 , pp. 253201, 2020.
@article{PhysRevLett.124.253201,
title = {Ultrafast Creation of Overlapping Rydberg Electrons in an Atomic BEC and Mott-Insulator Lattice},
author = {M Mizoguchi and Y Zhang and M Kunimi and A Tanaka and S Takeda and N Takei and V Bharti and K Koyasu and T Kishimoto and D Jaksch and A Glaetzle and M Kiffner and G Masella and G Pupillo and M Weidemüller and K Ohmori},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.124.253201},
doi = {10.1103/PhysRevLett.124.253201},
year = {2020},
date = {2020-06-01},
journal = {Phys. Rev. Lett.},
volume = {124},
pages = {253201},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Adriano Angelone, Tao Ying, Fabio Mezzacapo, Guido Masella, Marcello Dalmonte, Guido Pupillo
Nonequilibrium scenarios in cluster-forming quantum lattice models Journal Article
In: Phys. Rev. A, 101 , pp. 063603, 2020.
@article{PhysRevA.101.063603,
title = {Nonequilibrium scenarios in cluster-forming quantum lattice models},
author = {Adriano Angelone and Tao Ying and Fabio Mezzacapo and Guido Masella and Marcello Dalmonte and Guido Pupillo},
url = {https://link.aps.org/doi/10.1103/PhysRevA.101.063603},
doi = {10.1103/PhysRevA.101.063603},
year = {2020},
date = {2020-06-01},
journal = {Phys. Rev. A},
volume = {101},
pages = {063603},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Xiaolong Deng, Guido Masella, Guido Pupillo, Luis Santos
Universal Algebraic Growth of Entanglement Entropy in Many-Body Localized Systems with Power-Law Interactions Journal Article
In: Phys. Rev. Lett., 125 , pp. 010401, 2020.
@article{PhysRevLett.125.010401,
title = {Universal Algebraic Growth of Entanglement Entropy in Many-Body Localized Systems with Power-Law Interactions},
author = {Xiaolong Deng and Guido Masella and Guido Pupillo and Luis Santos},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.010401},
doi = {10.1103/PhysRevLett.125.010401},
year = {2020},
date = {2020-06-01},
journal = {Phys. Rev. Lett.},
volume = {125},
pages = {010401},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guido Pupillo, Primož Ziherl, Fabio Cinti
Quantum cluster quasicrystals Journal Article
In: Phys. Rev. B, 101 , pp. 134522, 2020.
@article{PhysRevB.101.134522,
title = {Quantum cluster quasicrystals},
author = {Guido Pupillo and Primož Ziherl and Fabio Cinti},
url = {https://link.aps.org/doi/10.1103/PhysRevB.101.134522},
doi = {10.1103/PhysRevB.101.134522},
year = {2020},
date = {2020-04-01},
journal = {Phys. Rev. B},
volume = {101},
pages = {134522},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
S Schütz, J Schachenmayer, D Hagenmüller, G K Brennen, T Volz, V Sandoghdar, T W Ebbesen, C Genes, G Pupillo
Ensemble-Induced Strong Light-Matter Coupling of a Single Quantum Emitter Journal Article
In: Phys. Rev. Lett., 124 , pp. 113602, 2020.
@article{PhysRevLett.124.113602,
title = {Ensemble-Induced Strong Light-Matter Coupling of a Single Quantum Emitter},
author = {S Schütz and J Schachenmayer and D Hagenmüller and G K Brennen and T Volz and V Sandoghdar and T W Ebbesen and C Genes and G Pupillo},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.124.113602},
doi = {10.1103/PhysRevLett.124.113602},
year = {2020},
date = {2020-03-01},
journal = {Phys. Rev. Lett.},
volume = {124},
pages = {113602},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
T S do Espirito Santo, P Weiss, A Cipris, R Kaiser, W Guerin, R Bachelard, J Schachenmayer
Collective excitation dynamics of a cold atom cloud Journal Article
In: Phys. Rev. A, 101 , pp. 013617, 2020.
@article{PhysRevA.101.013617,
title = {Collective excitation dynamics of a cold atom cloud},
author = {T S do Espirito Santo and P Weiss and A Cipris and R Kaiser and W Guerin and R Bachelard and J Schachenmayer},
url = {https://link.aps.org/doi/10.1103/PhysRevA.101.013617},
doi = {10.1103/PhysRevA.101.013617},
year = {2020},
date = {2020-01-01},
journal = {Phys. Rev. A},
volume = {101},
pages = {013617},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
2019
W Guerin, Espirito T S do Santo, P Weiss, A Cipris, J Schachenmayer, R Kaiser, R Bachelard
Collective Multimode Vacuum Rabi Splitting Journal Article
In: Phys. Rev. Lett., 123 , pp. 243401, 2019.
@article{PhysRevLett.123.243401,
title = {Collective Multimode Vacuum Rabi Splitting},
author = {W Guerin and Espirito T S do Santo and P Weiss and A Cipris and J Schachenmayer and R Kaiser and R Bachelard},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.243401},
doi = {10.1103/PhysRevLett.123.243401},
year = {2019},
date = {2019-12-01},
journal = {Phys. Rev. Lett.},
volume = {123},
pages = {243401},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Martin Gärttner, Arghavan Safavi-Naini, Johannes Schachenmayer, Ana Maria Rey
Doublon dynamics of Bose-Fermi mixtures in optical lattices Journal Article
In: Phys. Rev. A, 100 , pp. 053607, 2019.
Links | BibTeX | Tags: MPS, Optical lattices
@article{PhysRevA.100.053607,
title = {Doublon dynamics of Bose-Fermi mixtures in optical lattices},
author = {Martin Gärttner and Arghavan Safavi-Naini and Johannes Schachenmayer and Ana Maria Rey},
url = {https://link.aps.org/doi/10.1103/PhysRevA.100.053607},
doi = {10.1103/PhysRevA.100.053607},
year = {2019},
date = {2019-11-01},
journal = {Phys. Rev. A},
volume = {100},
pages = {053607},
publisher = {American Physical Society},
keywords = {MPS, Optical lattices},
pubstate = {published},
tppubtype = {article}
}
Thomas Botzung, Davide Vodola, Piero Naldesi, Markus Müller, Elisa Ercolessi, Guido Pupillo
Algebraic localization from power-law couplings in disordered quantum wires Journal Article
In: Phys. Rev. B, 100 , pp. 155136, 2019.
@article{PhysRevB.100.155136,
title = {Algebraic localization from power-law couplings in disordered quantum wires},
author = {Thomas Botzung and Davide Vodola and Piero Naldesi and Markus Müller and Elisa Ercolessi and Guido Pupillo},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.155136},
doi = {10.1103/PhysRevB.100.155136},
year = {2019},
date = {2019-10-01},
journal = {Phys. Rev. B},
volume = {100},
pages = {155136},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bihui Zhu, Ana Maria Rey, Johannes Schachenmayer
A generalized phase space approach for solving quantum spin dynamics Journal Article
In: New J. Phys. (fast track communication), 21 , pp. 082001, 2019.
Links | BibTeX | Tags: DTWA, GDTWA, phase space method, Truncated Wigner Approximation
@article{zhu_generalized_2019,
title = {A generalized phase space approach for solving quantum spin dynamics},
author = {Bihui Zhu, Ana Maria Rey, Johannes Schachenmayer},
url = {https://iopscience.iop.org/article/10.1088/1367-2630/ab354d},
doi = {10.1088/1367-2630/ab354d},
year = {2019},
date = {2019-08-09},
journal = {New J. Phys. (fast track communication)},
volume = {21},
pages = {082001},
keywords = {DTWA, GDTWA, phase space method, Truncated Wigner Approximation},
pubstate = {published},
tppubtype = {article}
}
Guido Masella, Adriano Angelone, Fabio Mezzacapo, Guido Pupillo, Nikolay V Prokofév
Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice Journal Article
In: Phys. Rev. Lett., 123 , pp. 045301, 2019.
@article{Masella2019,
title = {Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice},
author = {Guido Masella and Adriano Angelone and Fabio Mezzacapo and Guido Pupillo and Nikolay V Prokofév},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.045301},
doi = {10.1103/PhysRevLett.123.045301},
year = {2019},
date = {2019-07-01},
journal = {Phys. Rev. Lett.},
volume = {123},
pages = {045301},
publisher = {American Physical Society},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
S. Lepoutre, J. Schachenmayer, L. Gabardos, B. Zhu, B. Naylor, E. Marechal, O. Gorceix, A. M. Rey, L Vernac, B Laburthe-Tolra
Exploring out-of-equilibrium quantum magnetism and thermalization in a spin-3 many-body dipolar lattice system Journal Article
In: Nature Communications, 10 (1714), 2019.
Links | BibTeX | Tags: Condensed Matter - Quantum Gases, DTWA, GDTWA, magnetic atoms, Optical lattices, Truncated Wigner Approximation
@article{2018arXiv180302628L,
title = {Exploring out-of-equilibrium quantum magnetism and thermalization in a spin-3 many-body dipolar lattice system},
author = {S. {Lepoutre} and J. {Schachenmayer} and L. {Gabardos} and B. {Zhu} and B. {Naylor} and E. {Marechal} and O. {Gorceix} and A. M. {Rey} and L {Vernac} and B {Laburthe-Tolra}},
url = {https://www.nature.com/articles/s41467-019-09699-5},
doi = { 10.1038/s41467-019-09699-5},
year = {2019},
date = {2019-04-12},
journal = {Nature Communications},
volume = {10},
number = {1714},
keywords = {Condensed Matter - Quantum Gases, DTWA, GDTWA, magnetic atoms, Optical lattices, Truncated Wigner Approximation},
pubstate = {published},
tppubtype = {article}
}
Jaromir Panas, Mathieu Barbier, Andreas Geißler, Walter Hofstetter
Supersolid Phases of Rydberg-Excited Bosons on a Triangular Lattice Journal Article
In: arXiv:1903.01912 [cond-mat], 2019.
Abstract | BibTeX | Tags: Condensed Matter - Quantum Gases
@article{Panas2019,
title = {Supersolid Phases of Rydberg-Excited Bosons on a Triangular Lattice},
author = {Jaromir Panas and Mathieu Barbier and Andreas Geißler and Walter Hofstetter},
year = {2019},
date = {2019-01-01},
journal = {arXiv:1903.01912 [cond-mat]},
abstract = {Recent experiments with ultracold Rydberg-excited atoms have shown that long-range interactions can give rise to spatially ordered structures. Observation of crystalline phases in a system with Rydberg atoms loaded into an optical lattice seems also within reach. Here we investigate a bosonic model on a triangular lattice suitable for description of such experiments. Numerical simulations based on bosonic dynamical mean-field theory reveal a rich phase diagram with different supersolid phases. Comparison with the results obtained for a square lattice geometry shows qualitatively similar results in a wide range of parameters, however, on a triangular lattice we do not observe the checkerboard supersolid. Moreover, unlike on a square lattice we did not find a phase transition from uniform superfluid to supersolid induced by increase of the hopping amplitude on a triangular lattice. Based on our results we propose an intuitive interpretation of the nature of different supersolid phases. We also propose parameters for the experimental realization.},
keywords = {Condensed Matter - Quantum Gases},
pubstate = {published},
tppubtype = {article}
}
Recent experiments with ultracold Rydberg-excited atoms have shown that long-range interactions can give rise to spatially ordered structures. Observation of crystalline phases in a system with Rydberg atoms loaded into an optical lattice seems also within reach. Here we investigate a bosonic model on a triangular lattice suitable for description of such experiments. Numerical simulations based on bosonic dynamical mean-field theory reveal a rich phase diagram with different supersolid phases. Comparison with the results obtained for a square lattice geometry shows qualitatively similar results in a wide range of parameters, however, on a triangular lattice we do not observe the checkerboard supersolid. Moreover, unlike on a square lattice we did not find a phase transition from uniform superfluid to supersolid induced by increase of the hopping amplitude on a triangular lattice. Based on our results we propose an intuitive interpretation of the nature of different supersolid phases. We also propose parameters for the experimental realization.David Hagenmüller, Johannes Schachenmayer, Cyriaque Genet, Thomas W Ebbesen, Guido Pupillo
Enhancement of the Electron–Phonon Scattering Induced by Intrinsic Surface Plasmon–Phonon Polaritons Journal Article
In: ACS Photonics, 2019.
Abstract | Links | BibTeX | Tags: Condensed Matter - Mesoscale and Nanoscale Physics
@article{Hagenmuller2019,
title = {Enhancement of the Electron–Phonon Scattering Induced by Intrinsic Surface Plasmon–Phonon Polaritons},
author = {David Hagenmüller and Johannes Schachenmayer and Cyriaque Genet and Thomas W Ebbesen and Guido Pupillo},
doi = {10.1021/acsphotonics.9b00268},
year = {2019},
date = {2019-01-01},
journal = {ACS Photonics},
abstract = {We investigate light–matter coupling in metallic crystals where plasmons coexist with phonons exhibiting large oscillator strength. We demonstrate theoretically that this coexistence can lead to strong light–matter interactions without external resonators. When the frequencies of plasmons and phonons are comparable, hybridization of these collective matter modes occurs in the crystal. We show that the coupling of these modes to photonic degrees of freedom gives rise to intrinsic surface plasmon–phonon polaritons, which offer the unique possibility to control the phonon properties by tuning the electron density and the crystal thickness. In particular, dressed phonons with reduced frequency and large wave vectors arise in the case of quasi-2D crystals, which could lead to large enhancements of the electron–phonon scattering in the vibrational ultrastrong coupling regime. This suggests that photons can play a key role in determining the quantum properties of certain materials. A nonperturbative self-consistent Hamiltonian method is presented that is valid for arbitrarily large coupling strengths.},
keywords = {Condensed Matter - Mesoscale and Nanoscale Physics},
pubstate = {published},
tppubtype = {article}
}
We investigate light–matter coupling in metallic crystals where plasmons coexist with phonons exhibiting large oscillator strength. We demonstrate theoretically that this coexistence can lead to strong light–matter interactions without external resonators. When the frequencies of plasmons and phonons are comparable, hybridization of these collective matter modes occurs in the crystal. We show that the coupling of these modes to photonic degrees of freedom gives rise to intrinsic surface plasmon–phonon polaritons, which offer the unique possibility to control the phonon properties by tuning the electron density and the crystal thickness. In particular, dressed phonons with reduced frequency and large wave vectors arise in the case of quasi-2D crystals, which could lead to large enhancements of the electron–phonon scattering in the vibrational ultrastrong coupling regime. This suggests that photons can play a key role in determining the quantum properties of certain materials. A nonperturbative self-consistent Hamiltonian method is presented that is valid for arbitrarily large coupling strengths.Thomas Botzung, David Hagenmüller, Guido Masella, Jérôme Dubail, Nicolò Defenu, Andrea Trombettoni, Guido Pupillo
Effects of energy extensivity on the quantum phases of long-range interacting systems Miscellaneous Forthcoming
Forthcoming.
@misc{botzung2019effects,
title = {Effects of energy extensivity on the quantum phases of long-range interacting systems},
author = {Thomas Botzung and David Hagenmüller and Guido Masella and Jérôme Dubail and Nicolò Defenu and Andrea Trombettoni and Guido Pupillo},
url = {https://arxiv.org/abs/1909.12105},
year = {2019},
date = {2019-01-01},
keywords = {},
pubstate = {forthcoming},
tppubtype = {misc}
}
Thomas Botzung, Guido Pupillo, Pascal Simon, Roberta Citro, Elisa Ercolessi
One-dimensional extended Hubbard model with soft-core potential Miscellaneous Forthcoming
Forthcoming.
@misc{botzung2019onedimensional,
title = {One-dimensional extended Hubbard model with soft-core potential},
author = {Thomas Botzung and Guido Pupillo and Pascal Simon and Roberta Citro and Elisa Ercolessi},
url = {https://arxiv.org/abs/1909.12168},
year = {2019},
date = {2019-01-01},
keywords = {},
pubstate = {forthcoming},
tppubtype = {misc}
}
Anoop Thomas, Eloïse Devaux, Kalaivanan Nagarajan, Thibault Chervy, Marcus Seidel, David Hagenmüller, Stefan Schütz, Johannes Schachenmayer, Cyriaque Genet, Guido Pupillo, Thomas W Ebbesen
Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field Miscellaneous Forthcoming
Forthcoming.
@misc{thomas2019exploring,
title = {Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field},
author = {Anoop Thomas and Eloïse Devaux and Kalaivanan Nagarajan and Thibault Chervy and Marcus Seidel and David Hagenmüller and Stefan Schütz and Johannes Schachenmayer and Cyriaque Genet and Guido Pupillo and Thomas W Ebbesen},
url = {https://arxiv.org/abs/1911.01459},
year = {2019},
date = {2019-01-01},
keywords = {},
pubstate = {forthcoming},
tppubtype = {misc}
}
2018
David Hagenmüller, Johannes Schachenmayer, Cyriaque Genet, Thomas W Ebbesen, Guido Pupillo
Enhancement of the Electron-Phonon Scattering Induced by Intrinsic Surface Plasmon-Phonon Polaritons Journal Article
In: arXiv:1810.10190 [cond-mat], 2018.
Abstract | BibTeX | Tags: Condensed Matter - Mesoscale and Nanoscale Physics
@article{Hagenmuller2018,
title = {Enhancement of the Electron-Phonon Scattering Induced by Intrinsic Surface Plasmon-Phonon Polaritons},
author = {David Hagenmüller and Johannes Schachenmayer and Cyriaque Genet and Thomas W Ebbesen and Guido Pupillo},
year = {2018},
date = {2018-10-01},
journal = {arXiv:1810.10190 [cond-mat]},
abstract = {We investigate light-matter coupling in metallic crystals where plasmons coexist with phonons exhibiting large oscillator strength. We demonstrate theoretically that this coexistence can lead to strong light-matter interactions without external resonators. When the frequencies of plasmons and phonons are comparable, hybridization of these collective matter modes occurs in the crystal. We show that the coupling of these modes to photonic degrees of freedom gives rise to intrinsic surface plasmon-phonon polaritons, which offer the unique possibility to control the phonon properties by tuning the electron density and the crystal thickness. In particular, dressed phonons with reduced frequency and large wave vectors arise in the case of quasi-2D crystals, which leads to large enhancements of the electron-phonon scattering in the vibrational ultrastrong coupling regime. This suggests that photons can play a key role in determining the quantum properties of certain materials. A non-perturbative self-consistent Hamiltonian method is presented that is valid for arbitrarily large coupling strengths.},
keywords = {Condensed Matter - Mesoscale and Nanoscale Physics},
pubstate = {published},
tppubtype = {article}
}
We investigate light-matter coupling in metallic crystals where plasmons coexist with phonons exhibiting large oscillator strength. We demonstrate theoretically that this coexistence can lead to strong light-matter interactions without external resonators. When the frequencies of plasmons and phonons are comparable, hybridization of these collective matter modes occurs in the crystal. We show that the coupling of these modes to photonic degrees of freedom gives rise to intrinsic surface plasmon-phonon polaritons, which offer the unique possibility to control the phonon properties by tuning the electron density and the crystal thickness. In particular, dressed phonons with reduced frequency and large wave vectors arise in the case of quasi-2D crystals, which leads to large enhancements of the electron-phonon scattering in the vibrational ultrastrong coupling regime. This suggests that photons can play a key role in determining the quantum properties of certain materials. A non-perturbative self-consistent Hamiltonian method is presented that is valid for arbitrarily large coupling strengths.Thomas Botzung, Davide Vodola, Piero Naldesi, Markus Müller, Elisa Ercolessi, Guido Pupillo
Algebraic Localization from Power-Law Interactions in Disordered Quantum Wires Journal Article
In: arXiv:1810.09779 [cond-mat, physics:quant-ph], 2018.
Abstract | BibTeX | Tags: Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Strongly Correlated Electrons, Quantum Physics
@article{Botzung2018,
title = {Algebraic Localization from Power-Law Interactions in Disordered Quantum Wires},
author = {Thomas Botzung and Davide Vodola and Piero Naldesi and Markus Müller and Elisa Ercolessi and Guido Pupillo},
year = {2018},
date = {2018-10-01},
journal = {arXiv:1810.09779 [cond-mat, physics:quant-ph]},
abstract = {We analyze the effects of disorder on the correlation functions of one-dimensional quantum models of fermions and spins with long-range interactions that decay with distance $$backslash$ell$ as a power-law $1/$backslash$ell^$backslash$alpha$. Using a combination of analytical and numerical results, we demonstrate that power-law interactions imply a long-distance algebraic decay of correlations within disordered-localized phases, for all exponents $$backslash$alpha$. The exponent of algebraic decay depends only on $$backslash$alpha$, and not, e.g., on the strength of disorder. We find a similar algebraic localization for wave-functions. These results are in contrast to expectations from short-range models and are of direct relevance for a variety of quantum mechanical systems in atomic, molecular and solid-state physics.},
keywords = {Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Strongly Correlated Electrons, Quantum Physics},
pubstate = {published},
tppubtype = {article}
}
We analyze the effects of disorder on the correlation functions of one-dimensional quantum models of fermions and spins with long-range interactions that decay with distance $$backslash$ell$ as a power-law $1/$backslash$ell^$backslash$alpha$. Using a combination of analytical and numerical results, we demonstrate that power-law interactions imply a long-distance algebraic decay of correlations within disordered-localized phases, for all exponents $$backslash$alpha$. The exponent of algebraic decay depends only on $$backslash$alpha$, and not, e.g., on the strength of disorder. We find a similar algebraic localization for wave-functions. These results are in contrast to expectations from short-range models and are of direct relevance for a variety of quantum mechanical systems in atomic, molecular and solid-state physics.Rogelio Díaz-Méndez, Guido Pupillo, Fabio Mezzacapo, Mats Wallin, Jack Lidmar, Egor Babaev
Phase-Change Switching in 2D via Soft Interactions Journal Article
In: arXiv:1808.07918 [cond-mat], 2018.
Abstract | BibTeX | Tags: Condensed Matter - Statistical Mechanics
@article{Diaz-Mendez2018,
title = {Phase-Change Switching in 2D via Soft Interactions},
author = {Rogelio {Díaz-Méndez} and Guido Pupillo and Fabio Mezzacapo and Mats Wallin and Jack Lidmar and Egor Babaev},
year = {2018},
date = {2018-01-01},
journal = {arXiv:1808.07918 [cond-mat]},
abstract = {We present a new type of phase-change behavior relevant for information storage applications, that can be observed in 2D systems with cluster-forming ability. The temperature-based control of the ordering in 2D particle systems depends on the existence of a crystal-to-glass transition. We perform molecular dynamics simulations of models with soft interactions, demonstrating that the crystalline and amorphous structures can be easily tuned by heat pulses. The physical mechanism responsible for this behavior is a self-assembled polydispersity, that depends on the cluster-forming ability of the interactions. Therefore, the range of real materials that can perform such a transition is very wide in nature, reading from colloidal suspensions to vortex matter. The state of the art in soft matter experimental setups, controlling interactions, polydispersity and dimensionality, makes it a very fertile ground for practical applications.},
keywords = {Condensed Matter - Statistical Mechanics},
pubstate = {published},
tppubtype = {article}
}
We present a new type of phase-change behavior relevant for information storage applications, that can be observed in 2D systems with cluster-forming ability. The temperature-based control of the ordering in 2D particle systems depends on the existence of a crystal-to-glass transition. We perform molecular dynamics simulations of models with soft interactions, demonstrating that the crystalline and amorphous structures can be easily tuned by heat pulses. The physical mechanism responsible for this behavior is a self-assembled polydispersity, that depends on the cluster-forming ability of the interactions. Therefore, the range of real materials that can perform such a transition is very wide in nature, reading from colloidal suspensions to vortex matter. The state of the art in soft matter experimental setups, controlling interactions, polydispersity and dimensionality, makes it a very fertile ground for practical applications.David Hagenmüller, Stefan Schütz, Johannes Schachenmayer, Claudiu Genes, Guido Pupillo
Cavity-Assisted Mesoscopic Transport of Fermions: Coherent and Dissipative Dynamics Journal Article
In: Physical Review B, 97 (20), pp. 205303, 2018.
Abstract | Links | BibTeX | Tags:
@article{Hagenmuller2018a,
title = {Cavity-Assisted Mesoscopic Transport of Fermions: Coherent and Dissipative Dynamics},
author = {David Hagenmüller and Stefan Schütz and Johannes Schachenmayer and Claudiu Genes and Guido Pupillo},
doi = {10.1103/PhysRevB.97.205303},
year = {2018},
date = {2018-01-01},
journal = {Physical Review B},
volume = {97},
number = {20},
pages = {205303},
abstract = {We study the interplay between charge transport and light-matter interactions in a confined geometry by considering an open, mesoscopic chain of two-orbital systems resonantly coupled to a single bosonic mode close to its vacuum state. We introduce and benchmark different methods based on self-consistent solutions of nonequilibrium Green's functions and numerical simulations of the quantum master equation, and derive both analytical and numerical results. It is shown that in the dissipative regime where the cavity photon decay rate is the largest parameter, the light-matter coupling is responsible for a steady-state current enhancement scaling with the cooperativity parameter. We further identify different regimes of interest depending on the ratio between the cavity decay rate and the electronic bandwidth. Considering the situation where the lower band has a vanishing bandwidth, we show that for a high-finesse cavity, the properties of the resonant Bloch state in the upper band are transferred to the lower one, giving rise to a delocalized state along the chain. Conversely, in the dissipative regime with low-cavity quality factors, we find that the current enhancement is due to a collective decay of populations from the upper to the lower band.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We study the interplay between charge transport and light-matter interactions in a confined geometry by considering an open, mesoscopic chain of two-orbital systems resonantly coupled to a single bosonic mode close to its vacuum state. We introduce and benchmark different methods based on self-consistent solutions of nonequilibrium Green's functions and numerical simulations of the quantum master equation, and derive both analytical and numerical results. It is shown that in the dissipative regime where the cavity photon decay rate is the largest parameter, the light-matter coupling is responsible for a steady-state current enhancement scaling with the cooperativity parameter. We further identify different regimes of interest depending on the ratio between the cavity decay rate and the electronic bandwidth. Considering the situation where the lower band has a vanishing bandwidth, we show that for a high-finesse cavity, the properties of the resonant Bloch state in the upper band are transferred to the lower one, giving rise to a delocalized state along the chain. Conversely, in the dissipative regime with low-cavity quality factors, we find that the current enhancement is due to a collective decay of populations from the upper to the lower band.2017
David Hagenmüller, Johannes Schachenmayer, Stefan Schütz, Claudiu Genes, Guido Pupillo
Cavity-Enhanced Transport of Charge Journal Article
In: Physical Review Letters, 119 (22), pp. 223601, 2017.
Abstract | Links | BibTeX | Tags:
@article{Hagenmuller2017,
title = {Cavity-Enhanced Transport of Charge},
author = {David Hagenmüller and Johannes Schachenmayer and Stefan Schütz and Claudiu Genes and Guido Pupillo},
doi = {10.1103/PhysRevLett.119.223601},
year = {2017},
date = {2017-11-01},
journal = {Physical Review Letters},
volume = {119},
number = {22},
pages = {223601},
abstract = {We theoretically investigate charge transport through electronic bands of a mesoscopic one-dimensional system, where interband transitions are coupled to a confined cavity mode, initially prepared close to its vacuum. This coupling leads to light-matter hybridization where the dressed fermionic bands interact via absorption and emission of dressed cavity photons. Using a self-consistent nonequilibrium Green's function method, we compute electronic transmissions and cavity photon spectra and demonstrate how light-matter coupling can lead to an enhancement of charge conductivity in the steady state. We find that depending on cavity loss rate, electronic bandwidth, and coupling strength, the dynamics involves either an individual or a collective response of Bloch states, and we explain how this affects the current enhancement. We show that the charge conductivity enhancement can reach orders of magnitudes under experimentally relevant conditions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We theoretically investigate charge transport through electronic bands of a mesoscopic one-dimensional system, where interband transitions are coupled to a confined cavity mode, initially prepared close to its vacuum. This coupling leads to light-matter hybridization where the dressed fermionic bands interact via absorption and emission of dressed cavity photons. Using a self-consistent nonequilibrium Green's function method, we compute electronic transmissions and cavity photon spectra and demonstrate how light-matter coupling can lead to an enhancement of charge conductivity in the steady state. We find that depending on cavity loss rate, electronic bandwidth, and coupling strength, the dynamics involves either an individual or a collective response of Bloch states, and we explain how this affects the current enhancement. We show that the charge conductivity enhancement can reach orders of magnitudes under experimentally relevant conditions.Nóra Sándor, Rosario González-Férez, Paul S Julienne, Guido Pupillo
Rydberg Optical Feshbach Resonances in Cold Gases Journal Article
In: Physical Review A, 96 (3), pp. 032719, 2017.
Abstract | Links | BibTeX | Tags:
@article{Sandor2017,
title = {Rydberg Optical Feshbach Resonances in Cold Gases},
author = {Nóra Sándor and Rosario {González-Férez} and Paul S Julienne and Guido Pupillo},
doi = {10.1103/PhysRevA.96.032719},
year = {2017},
date = {2017-09-01},
journal = {Physical Review A},
volume = {96},
number = {3},
pages = {032719},
abstract = {We propose a scheme to efficiently tune the scattering length of two colliding ground-state atoms by off-resonantly coupling the scattering state to an excited Rydberg molecular state using laser light. For the s-wave scattering of two colliding 87Rb atoms, we demonstrate that the effective optical length and pole strength of this Rydberg optical Feshbach resonance can be tuned over several orders of magnitude, while incoherent processes and losses are minimized. Given the ubiquity of Rydberg molecular states, this technique should be generally applicable to homonuclear atomic pairs as well as to atomic mixtures with s-wave (or even p-wave) scattering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We propose a scheme to efficiently tune the scattering length of two colliding ground-state atoms by off-resonantly coupling the scattering state to an excited Rydberg molecular state using laser light. For the s-wave scattering of two colliding 87Rb atoms, we demonstrate that the effective optical length and pole strength of this Rydberg optical Feshbach resonance can be tuned over several orders of magnitude, while incoherent processes and losses are minimized. Given the ubiquity of Rydberg molecular states, this technique should be generally applicable to homonuclear atomic pairs as well as to atomic mixtures with s-wave (or even p-wave) scattering.O. L. Acevedo, A. Safavi-Naini, J. Schachenmayer, M. L. Wall, R. Nandkishore, A. M. Rey
Exploring many-body localization and thermalization using semiclassical methods Journal Article
In: Phys. Rev. A, 96 , pp. 033604, 2017.
Links | BibTeX | Tags: DTWA, phase space method, Truncated Wigner Approximation
@article{PhysRevA.96.033604,
title = {Exploring many-body localization and thermalization using semiclassical methods},
author = {O. L. Acevedo and A. Safavi-Naini and J. Schachenmayer and M. L. Wall and R. Nandkishore and A. M. Rey},
url = {https://link.aps.org/doi/10.1103/PhysRevA.96.033604},
doi = {10.1103/PhysRevA.96.033604},
year = {2017},
date = {2017-09-01},
journal = {Phys. Rev. A},
volume = {96},
pages = {033604},
publisher = {American Physical Society},
keywords = {DTWA, phase space method, Truncated Wigner Approximation},
pubstate = {published},
tppubtype = {article}
}
Rogelio Díaz-Méndez, Fabio Mezzacapo, Wolfgang Lechner, Fabio Cinti, Egor Babaev, Guido Pupillo
Glass Transitions in Monodisperse Cluster-Forming Ensembles: Vortex Matter in Type-1.5 Superconductors Journal Article
In: Physical Review Letters, 118 (6), pp. 067001, 2017.
Abstract | Links | BibTeX | Tags:
@article{Diaz-Mendez2017,
title = {Glass Transitions in Monodisperse Cluster-Forming Ensembles: Vortex Matter in Type-1.5 Superconductors},
author = {Rogelio {Díaz-Méndez} and Fabio Mezzacapo and Wolfgang Lechner and Fabio Cinti and Egor Babaev and Guido Pupillo},
doi = {10.1103/PhysRevLett.118.067001},
year = {2017},
date = {2017-02-01},
journal = {Physical Review Letters},
volume = {118},
number = {6},
pages = {067001},
abstract = {At low enough temperatures and high densities, the equilibrium configuration of an ensemble of ultrasoft particles is a self-assembled, ordered, cluster crystal. In the present Letter, we explore the out-of-equilibrium dynamics for a two-dimensional realization, which is relevant to superconducting materials with multiscale intervortex forces. We find that, for small temperatures following a quench, the suppression of the thermally activated particle hopping hinders the ordering. This results in a glass transition for a monodispersed ensemble, for which we derive a microscopic explanation in terms of an ``effective polydispersity'' induced by multiscale interactions. This demonstrates that a vortex glass can form in clean systems of thin films of ``type-1.5'' superconductors. An additional setup to study this physics can be layered superconducting systems, where the shape of the effective vortex-vortex interactions can be engineered.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
At low enough temperatures and high densities, the equilibrium configuration of an ensemble of ultrasoft particles is a self-assembled, ordered, cluster crystal. In the present Letter, we explore the out-of-equilibrium dynamics for a two-dimensional realization, which is relevant to superconducting materials with multiscale intervortex forces. We find that, for small temperatures following a quench, the suppression of the thermally activated particle hopping hinders the ordering. This results in a glass transition for a monodispersed ensemble, for which we derive a microscopic explanation in terms of an ``effective polydispersity'' induced by multiscale interactions. This demonstrates that a vortex glass can form in clean systems of thin films of ``type-1.5'' superconductors. An additional setup to study this physics can be layered superconducting systems, where the shape of the effective vortex-vortex interactions can be engineered.2016
L Lepori, D Vodola, G Pupillo, G Gori, A Trombettoni
Effective Theory and Breakdown of Conformal Symmetry in a Long-Range Quantum Chain Journal Article
In: Annals of Physics, 374 , pp. 35-66, 2016, ISSN: 0003-4916.
Abstract | Links | BibTeX | Tags: Conformal field theory, Integrable models, Long-range systems, Quantum entanglement, Quantum phase transitions, Renormalization group
@article{Lepori2016,
title = {Effective Theory and Breakdown of Conformal Symmetry in a Long-Range Quantum Chain},
author = {L Lepori and D Vodola and G Pupillo and G Gori and A Trombettoni},
doi = {10.1016/j.aop.2016.07.026},
issn = {0003-4916},
year = {2016},
date = {2016-11-01},
journal = {Annals of Physics},
volume = {374},
pages = {35-66},
abstract = {We deal with the problem of studying the symmetries and the effective theories of long-range models around their critical points. A prominent issue is to determine whether they possess (or not) conformal symmetry (CS) at criticality and how the presence of CS depends on the range of the interactions. To have a model, both simple to treat and interesting, where to investigate these questions, we focus on the Kitaev chain with long-range pairings decaying with distance as power-law with exponent $alpha$. This is a quadratic solvable model, yet displaying non-trivial quantum phase transitions. Two critical lines are found, occurring respectively at a positive and a negative chemical potential. Focusing first on the critical line at positive chemical potential, by means of a renormalization group approach we derive its effective theory close to criticality. Our main result is that the effective action is the sum of two terms: a Dirac action SD, found in the short-range Ising universality class, and an ``anomalous'' CS breaking term SAN. While SD originates from low-energy excitations in the spectrum, SAN originates from the higher energy modes where singularities develop, due to the long-range nature of the model. At criticality SAN flows to zero for $alpha>$2, while for $alpha<$2 it dominates and determines the breakdown of the CS. Out of criticality SAN breaks, in the considered approximation, the effective Lorentz invariance (ELI) for every finite $alpha$. As $alpha$ increases such ELI breakdown becomes less and less pronounced and in the short-range limit $alpharightarrowinfty$ the ELI is restored. In order to test the validity of the determined effective theory, we compared the two-fermion static correlation functions and the von Neumann entropy obtained from them with the ones calculated on the lattice, finding agreement. These results explain two observed features characteristic of long-range models, the hybrid decay of static correlation functions within gapped phases and the area-law violation for the von Neumann entropy. The proposed scenario is expected to hold in other long-range models displaying quasiparticle excitations in ballistic regime. From the effective theory one can also see that new phases emerge for $alpha<$1. Finally we show that at every finite $alpha$ the critical exponents, defined as for the short-range ($alpharightarrowinfty$) model, are not altered. This also shows that the long-range paired Kitaev chain provides an example of a long-range model in which the value of $alpha$ where the CS is broken does not coincide with the value at which the critical exponents start to differ from the ones of the corresponding short-range model. At variance, for the second critical line, having negative chemical potential, only SAN (SD) is present for 1$$2). Close to this line, where the minimum of the spectrum coincides with the momentum where singularities develop, the critical exponents change where CS is broken.},
keywords = {Conformal field theory, Integrable models, Long-range systems, Quantum entanglement, Quantum phase transitions, Renormalization group},
pubstate = {published},
tppubtype = {article}
}
We deal with the problem of studying the symmetries and the effective theories of long-range models around their critical points. A prominent issue is to determine whether they possess (or not) conformal symmetry (CS) at criticality and how the presence of CS depends on the range of the interactions. To have a model, both simple to treat and interesting, where to investigate these questions, we focus on the Kitaev chain with long-range pairings decaying with distance as power-law with exponent $alpha$. This is a quadratic solvable model, yet displaying non-trivial quantum phase transitions. Two critical lines are found, occurring respectively at a positive and a negative chemical potential. Focusing first on the critical line at positive chemical potential, by means of a renormalization group approach we derive its effective theory close to criticality. Our main result is that the effective action is the sum of two terms: a Dirac action SD, found in the short-range Ising universality class, and an ``anomalous'' CS breaking term SAN. While SD originates from low-energy excitations in the spectrum, SAN originates from the higher energy modes where singularities develop, due to the long-range nature of the model. At criticality SAN flows to zero for $alpha>$2, while for $alpha<$2 it dominates and determines the breakdown of the CS. Out of criticality SAN breaks, in the considered approximation, the effective Lorentz invariance (ELI) for every finite $alpha$. As $alpha$ increases such ELI breakdown becomes less and less pronounced and in the short-range limit $alpharightarrowinfty$ the ELI is restored. In order to test the validity of the determined effective theory, we compared the two-fermion static correlation functions and the von Neumann entropy obtained from them with the ones calculated on the lattice, finding agreement. These results explain two observed features characteristic of long-range models, the hybrid decay of static correlation functions within gapped phases and the area-law violation for the von Neumann entropy. The proposed scenario is expected to hold in other long-range models displaying quasiparticle excitations in ballistic regime. From the effective theory one can also see that new phases emerge for $alpha<$1. Finally we show that at every finite $alpha$ the critical exponents, defined as for the short-range ($alpharightarrowinfty$) model, are not altered. This also shows that the long-range paired Kitaev chain provides an example of a long-range model in which the value of $alpha$ where the CS is broken does not coincide with the value at which the critical exponents start to differ from the ones of the corresponding short-range model. At variance, for the second critical line, having negative chemical potential, only SAN (SD) is present for 1$<alpha<$2 (for $alpha>$2). Close to this line, where the minimum of the spectrum coincides with the momentum where singularities develop, the critical exponents change where CS is broken.Marina Litinskaya, Edoardo Tignone, Guido Pupillo
Cavity Polaritons with Rydberg Blockade and Long-Range Interactions Journal Article
In: Journal of Physics B: Atomic, Molecular and Optical Physics, 49 (16), pp. 164006, 2016, ISSN: 0953-4075.
Abstract | Links | BibTeX | Tags:
@article{Litinskaya2016,
title = {Cavity Polaritons with Rydberg Blockade and Long-Range Interactions},
author = {Marina Litinskaya and Edoardo Tignone and Guido Pupillo},
doi = {10.1088/0953-4075/49/16/164006},
issn = {0953-4075},
year = {2016},
date = {2016-08-01},
journal = {Journal of Physics B: Atomic, Molecular and Optical Physics},
volume = {49},
number = {16},
pages = {164006},
abstract = {We study interactions between polaritons, arising when photons strongly couple to collective excitations in an array of two-level atoms trapped in an optical lattice inside a cavity. We consider two types of interactions between atoms: dipolar forces and atomic saturability, which range from hard-core repulsion to Rydberg blockade. We show that, in spite of the underlying repulsion in the subsystem of atomic excitations, saturability induces a broadband bunching of photons for two-polariton scattering states. We interpret this bunching as a result of interference, and trace it back to the mismatch of the quantization volumes for atomic excitations and photons. We also examine bound bipolaritonic states: these include states created by dipolar forces, as well as a gap bipolariton, which forms solely due to saturability effects in the atomic transition. Both types of bound states exhibit strong bunching in the photonic component. We discuss the dependence of bunching on experimentally relevant parameters.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We study interactions between polaritons, arising when photons strongly couple to collective excitations in an array of two-level atoms trapped in an optical lattice inside a cavity. We consider two types of interactions between atoms: dipolar forces and atomic saturability, which range from hard-core repulsion to Rydberg blockade. We show that, in spite of the underlying repulsion in the subsystem of atomic excitations, saturability induces a broadband bunching of photons for two-polariton scattering states. We interpret this bunching as a result of interference, and trace it back to the mismatch of the quantization volumes for atomic excitations and photons. We also examine bound bipolaritonic states: these include states created by dipolar forces, as well as a gap bipolariton, which forms solely due to saturability effects in the atomic transition. Both types of bound states exhibit strong bunching in the photonic component. We discuss the dependence of bunching on experimentally relevant parameters.Alejandro Mendoza-Coto, Rogelio Díaz-Méndez, Guido Pupillo
Event-Driven Monte Carlo: Exact Dynamics at All Time Scales for Discrete-Variable Models Journal Article
In: EPL (Europhysics Letters), 114 (5), pp. 50003, 2016, ISSN: 0295-5075.
Abstract | Links | BibTeX | Tags:
@article{Mendoza-Coto2016,
title = {Event-Driven Monte Carlo: Exact Dynamics at All Time Scales for Discrete-Variable Models},
author = {Alejandro {Mendoza-Coto} and Rogelio {Díaz-Méndez} and Guido Pupillo},
doi = {10.1209/0295-5075/114/50003},
issn = {0295-5075},
year = {2016},
date = {2016-06-01},
journal = {EPL (Europhysics Letters)},
volume = {114},
number = {5},
pages = {50003},
abstract = {We present an algorithm for the simulation of the exact real-time dynamics of classical many-body systems with discrete energy levels. In the same spirit of kinetic Monte Carlo methods, a stochastic solution of the master equation is found, with no need to define any other phase-space construction. However, unlike existing methods, the present algorithm does not assume any particular statistical distribution to perform moves or to advance the time, and thus is a unique tool for the numerical exploration of fast and ultra-fast dynamical regimes. By decomposing the problem in a set of two-level subsystems, we find a natural variable step size, that is well defined from the normalization condition of the transition probabilities between the levels. We successfully test the algorithm with known exact solutions for non-equilibrium dynamics and equilibrium thermodynamical properties of Ising-spin models in one and two dimensions, and compare to standard implementations of kinetic Monte Carlo methods. The present algorithm is directly applicable to the study of the real-time dynamics of a large class of classical Markovian chains, and particularly to short-time situations where the exact evolution is relevant.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We present an algorithm for the simulation of the exact real-time dynamics of classical many-body systems with discrete energy levels. In the same spirit of kinetic Monte Carlo methods, a stochastic solution of the master equation is found, with no need to define any other phase-space construction. However, unlike existing methods, the present algorithm does not assume any particular statistical distribution to perform moves or to advance the time, and thus is a unique tool for the numerical exploration of fast and ultra-fast dynamical regimes. By decomposing the problem in a set of two-level subsystems, we find a natural variable step size, that is well defined from the normalization condition of the transition probabilities between the levels. We successfully test the algorithm with known exact solutions for non-equilibrium dynamics and equilibrium thermodynamical properties of Ising-spin models in one and two dimensions, and compare to standard implementations of kinetic Monte Carlo methods. The present algorithm is directly applicable to the study of the real-time dynamics of a large class of classical Markovian chains, and particularly to short-time situations where the exact evolution is relevant.Marina Litinskaya, Edoardo Tignone, Guido Pupillo
Broadband Photon-Photon Interactions Mediated by Cold Atoms in a Photonic Crystal Fiber Journal Article
In: Scientific Reports, 6 , pp. 25630, 2016, ISSN: 2045-2322.
Abstract | Links | BibTeX | Tags:
@article{Litinskaya2016a,
title = {Broadband Photon-Photon Interactions Mediated by Cold Atoms in a Photonic Crystal Fiber},
author = {Marina Litinskaya and Edoardo Tignone and Guido Pupillo},
doi = {10.1038/srep25630},
issn = {2045-2322},
year = {2016},
date = {2016-05-01},
journal = {Scientific Reports},
volume = {6},
pages = {25630},
abstract = {We demonstrate theoretically that photon-photon attraction can be engineered in the continuum of scattering states for pairs of photons propagating in a hollow-core photonic crystal fiber filled with cold atoms. The atoms are regularly spaced in an optical lattice configuration and the photons are resonantly tuned to an internal atomic transition. We show that the hard-core repulsion resulting from saturation of the atomic transitions induces bunching in the photonic component of the collective atom-photon modes (polaritons). Bunching is obtained in a frequency range as large as tens of GHz, and can be controlled by the inter-atomic separation. We provide a fully analytical explanation for this phenomenon by proving that correlations result from a mismatch of the quantization volumes for atomic excitations and photons in the continuum. Even stronger correlations can be observed for in-gap two-polariton bound states. Our theoretical results use parameters relevant for current experiments and suggest a simple and feasible way to induce interactions between photons.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We demonstrate theoretically that photon-photon attraction can be engineered in the continuum of scattering states for pairs of photons propagating in a hollow-core photonic crystal fiber filled with cold atoms. The atoms are regularly spaced in an optical lattice configuration and the photons are resonantly tuned to an internal atomic transition. We show that the hard-core repulsion resulting from saturation of the atomic transitions induces bunching in the photonic component of the collective atom-photon modes (polaritons). Bunching is obtained in a frequency range as large as tens of GHz, and can be controlled by the inter-atomic separation. We provide a fully analytical explanation for this phenomenon by proving that correlations result from a mismatch of the quantization volumes for atomic excitations and photons in the continuum. Even stronger correlations can be observed for in-gap two-polariton bound states. Our theoretical results use parameters relevant for current experiments and suggest a simple and feasible way to induce interactions between photons.Tao Ying, Marcello Dalmonte, Adriano Angelone, Fabio Mezzacapo, Peter Zoller, Guido Pupillo
Cluster Bose Metals Journal Article
In: arXiv:1606.04267 [cond-mat], 2016.
Abstract | BibTeX | Tags: Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons
@article{Ying2016,
title = {Cluster Bose Metals},
author = {Tao Ying and Marcello Dalmonte and Adriano Angelone and Fabio Mezzacapo and Peter Zoller and Guido Pupillo},
year = {2016},
date = {2016-01-01},
journal = {arXiv:1606.04267 [cond-mat]},
abstract = {Quantum phases of matter are usually characterised by broken symmetries. Identifying physical mechanisms and microscopic Hamiltonians that elude this paradigm is one of the key present challenges in many-body physics. Here, we use quantum Monte-Carlo simulations to show that a Bose metal phase, breaking no symmetries, is realized in simple Hubbard models for bosonic particles on a square lattice complemented by soft-shoulder interactions. The Bose metal appears at strong coupling and is separated from a supersolid phase and a superfluid at weaker couplings. The enabling mechanism is provided by cluster formation in the corresponding classical tiling problem. The identification of the cluster mechanism paves the way to the realization of exotic quantum liquids in both natural and synthetic quantum matter that harbors cluster formation.},
keywords = {Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons},
pubstate = {published},
tppubtype = {article}
}
Quantum phases of matter are usually characterised by broken symmetries. Identifying physical mechanisms and microscopic Hamiltonians that elude this paradigm is one of the key present challenges in many-body physics. Here, we use quantum Monte-Carlo simulations to show that a Bose metal phase, breaking no symmetries, is realized in simple Hubbard models for bosonic particles on a square lattice complemented by soft-shoulder interactions. The Bose metal appears at strong coupling and is separated from a supersolid phase and a superfluid at weaker couplings. The enabling mechanism is provided by cluster formation in the corresponding classical tiling problem. The identification of the cluster mechanism paves the way to the realization of exotic quantum liquids in both natural and synthetic quantum matter that harbors cluster formation.Nobuyuki Takei, Christian Sommer, Claudiu Genes, Guido Pupillo, Haruka Goto, Kuniaki Koyasu, Hisashi Chiba, Matthias Weidemüller, Kenji Ohmori
Direct Observation of Ultrafast Many-Body Electron Dynamics in an Ultracold Rydberg Gas Journal Article
In: Nature Communications, 7 , pp. 13449, 2016, ISSN: 2041-1723.
Abstract | Links | BibTeX | Tags:
@article{Takei2016,
title = {Direct Observation of Ultrafast Many-Body Electron Dynamics in an Ultracold Rydberg Gas},
author = {Nobuyuki Takei and Christian Sommer and Claudiu Genes and Guido Pupillo and Haruka Goto and Kuniaki Koyasu and Hisashi Chiba and Matthias Weidemüller and Kenji Ohmori},
doi = {10.1038/ncomms13449},
issn = {2041-1723},
year = {2016},
date = {2016-01-01},
journal = {Nature Communications},
volume = {7},
pages = {13449},
abstract = {Many-body correlations govern a variety of important quantum phenomena such as the emergence of superconductivity and magnetism. Understanding quantum many-body systems is thus one of the central goals of modern sciences. Here we demonstrate an experimental approach towards this goal by utilizing an ultracold Rydberg gas generated with a broadband picosecond laser pulse. We follow the ultrafast evolution of its electronic coherence by time-domain Ramsey interferometry with attosecond precision. The observed electronic coherence shows an ultrafast oscillation with a period of 1 femtosecond, whose phase shift on the attosecond timescale is consistent with many-body correlations among Rydberg atoms beyond mean-field approximations. This coherent and ultrafast many-body dynamics is actively controlled by tuning the orbital size and population of the Rydberg state, as well as the mean atomic distance. Our approach will offer a versatile platform to observe and manipulate non-equilibrium dynamics of quantum many-body systems on the ultrafast timescale.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Many-body correlations govern a variety of important quantum phenomena such as the emergence of superconductivity and magnetism. Understanding quantum many-body systems is thus one of the central goals of modern sciences. Here we demonstrate an experimental approach towards this goal by utilizing an ultracold Rydberg gas generated with a broadband picosecond laser pulse. We follow the ultrafast evolution of its electronic coherence by time-domain Ramsey interferometry with attosecond precision. The observed electronic coherence shows an ultrafast oscillation with a period of 1 femtosecond, whose phase shift on the attosecond timescale is consistent with many-body correlations among Rydberg atoms beyond mean-field approximations. This coherent and ultrafast many-body dynamics is actively controlled by tuning the orbital size and population of the Rydberg state, as well as the mean atomic distance. Our approach will offer a versatile platform to observe and manipulate non-equilibrium dynamics of quantum many-body systems on the ultrafast timescale.Adriano Angelone, Fabio Mezzacapo, Guido Pupillo
Superglass Phase of Interaction-Blockaded Gases on a Triangular Lattice Journal Article
In: Physical Review Letters, 116 (13), pp. 135303, 2016.
Abstract | Links | BibTeX | Tags:
@article{Angelone2016,
title = {Superglass Phase of Interaction-Blockaded Gases on a Triangular Lattice},
author = {Adriano Angelone and Fabio Mezzacapo and Guido Pupillo},
doi = {10.1103/PhysRevLett.116.135303},
year = {2016},
date = {2016-01-01},
journal = {Physical Review Letters},
volume = {116},
number = {13},
pages = {135303},
abstract = {We investigate the quantum phases of monodispersed bosonic gases confined to a triangular lattice and interacting via a class of soft-shoulder potentials. The latter correspond to soft-core potentials with an additional hard-core onsite interaction. Using exact quantum Monte Carlo simulations, we show that the low temperature phases for weak and strong interactions following a temperature quench are a homogeneous superfluid and a glass, respectively. The latter is an insulating phase characterized by inhomogeneity in the density distribution and structural disorder. Remarkably, we find that for intermediate interaction strengths a superglass occurs in an extended region of the phase diagram, where glassy behavior coexists with a sizable finite superfluid fraction. This glass phase is obtained in the absence of geometrical frustration or external disorder and is a result of the competition of quantum fluctuations and cluster formation in the corresponding classical ground state. For high enough temperature, the glass and superglass turn into a floating stripe solid and a supersolid, respectively. Given the simplicity and generality of the model, these phases should be directly relevant for state-of-the-art experiments with Rydberg-dressed atoms in optical lattices.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigate the quantum phases of monodispersed bosonic gases confined to a triangular lattice and interacting via a class of soft-shoulder potentials. The latter correspond to soft-core potentials with an additional hard-core onsite interaction. Using exact quantum Monte Carlo simulations, we show that the low temperature phases for weak and strong interactions following a temperature quench are a homogeneous superfluid and a glass, respectively. The latter is an insulating phase characterized by inhomogeneity in the density distribution and structural disorder. Remarkably, we find that for intermediate interaction strengths a superglass occurs in an extended region of the phase diagram, where glassy behavior coexists with a sizable finite superfluid fraction. This glass phase is obtained in the absence of geometrical frustration or external disorder and is a result of the competition of quantum fluctuations and cluster formation in the corresponding classical ground state. For high enough temperature, the glass and superglass turn into a floating stripe solid and a supersolid, respectively. Given the simplicity and generality of the model, these phases should be directly relevant for state-of-the-art experiments with Rydberg-dressed atoms in optical lattices.Fabio Mezzacapo, Adriano Angelone, Guido Pupillo
Two Holes in a Two-Dimensional Quantum Antiferromagnet: A Variational Study Based on Entangled-Plaquette States Journal Article
In: Physical Review B, 94 (15), pp. 155120, 2016.
Abstract | Links | BibTeX | Tags:
@article{Mezzacapo2016,
title = {Two Holes in a Two-Dimensional Quantum Antiferromagnet: A Variational Study Based on Entangled-Plaquette States},
author = {Fabio Mezzacapo and Adriano Angelone and Guido Pupillo},
doi = {10.1103/PhysRevB.94.155120},
year = {2016},
date = {2016-01-01},
journal = {Physical Review B},
volume = {94},
number = {15},
pages = {155120},
abstract = {We show that the entangled-plaquette variational Ansatz can be adapted to study the two-dimensional t-J model in the presence of two mobile holes. Specifically, we focus on a square lattice comprising up to N=256 sites in the parameter range 0.4$łeq$J/t$łeq$2.0. Ground state energies are obtained via the optimization of a wave function in which the weight of a given configuration is expressed in terms of variational coefficients associated with square and linear entangled plaquettes. Our estimates are in excellent agreement with exact results available for the N=16 lattice. By extending our study to considerably larger systems we find, based on the analysis of the long-distance tail of the probability of finding two holes at spatial separation r, and on our computed two-hole binding energies, the existence of a two-hole bound state for all the values of J/t explored here. It is estimated that d-wave binding of the two holes does not occur for J/t},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We show that the entangled-plaquette variational Ansatz can be adapted to study the two-dimensional t-J model in the presence of two mobile holes. Specifically, we focus on a square lattice comprising up to N=256 sites in the parameter range 0.4$łeq$J/t$łeq$2.0. Ground state energies are obtained via the optimization of a wave function in which the weight of a given configuration is expressed in terms of variational coefficients associated with square and linear entangled plaquettes. Our estimates are in excellent agreement with exact results available for the N=16 lattice. By extending our study to considerably larger systems we find, based on the analysis of the long-distance tail of the probability of finding two holes at spatial separation r, and on our computed two-hole binding energies, the existence of a two-hole bound state for all the values of J/t explored here. It is estimated that d-wave binding of the two holes does not occur for J/tDavide Vodola, Luca Lepori, Elisa Ercolessi, Guido Pupillo
Long-Range Ising and Kitaev Models: Phases, Correlations and Edge Modes Journal Article
In: New Journal of Physics, 18 (1), pp. 015001, 2016, ISSN: 1367-2630.
Abstract | Links | BibTeX | Tags:
@article{Vodola2016,
title = {Long-Range Ising and Kitaev Models: Phases, Correlations and Edge Modes},
author = {Davide Vodola and Luca Lepori and Elisa Ercolessi and Guido Pupillo},
doi = {10.1088/1367-2630/18/1/015001},
issn = {1367-2630},
year = {2016},
date = {2016-01-01},
journal = {New Journal of Physics},
volume = {18},
number = {1},
pages = {015001},
abstract = {We analyze the quantum phases, correlation functions and edge modes for a class of spin-1/2 and fermionic models related to the one-dimensional Ising chain in the presence of a transverse field. These models are the Ising chain with anti-ferromagnetic long-range interactions that decay with distance r as ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn1.gif] $1/r^$backslash$alpha $ , as well as a related class of fermionic Hamiltonians that generalize the Kitaev chain, where both the hopping and pairing terms are long-range and their relative strength can be varied. For these models, we provide the phase diagram for all exponents $alpha$ , based on an analysis of the entanglement entropy, the decay of correlation functions, and the edge modes in the case of open chains. We demonstrate that violations of the area law can occur for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn2.gif] $$backslash$alpha $backslash$lesssim 1$ , while connected correlation functions can decay with a hybrid exponential and power-law behavior, with a power that is $alpha$ -dependent. Interestingly, for the fermionic models we provide an exact analytical derivation for the decay of the correlation functions at every $alpha$ . Along the critical lines, for all models breaking of conformal symmetry is argued at low enough $alpha$ . For the fermionic models we show that the edge modes, massless for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn3.gif] $$backslash$alpha $backslash$gtrsim 1$ , can acquire a mass for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn4.gif] $$backslash$alpha $backslash$lt 1$ . The mass of these modes can be tuned by varying the relative strength of the kinetic and pairing terms in the Hamiltonian. Interestingly, for the Ising chain a similar edge localization appears for the first and second excited states on the paramagnetic side of the phase diagram, where edge modes are not expected. We argue that, at least for the fermionic chains, these massive states correspond to the appearance of new phases, notably approached via quantum phase transitions without mass gap closure. Finally, we discuss the possibility to detect some of these effects in experiments with cold trapped ions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We analyze the quantum phases, correlation functions and edge modes for a class of spin-1/2 and fermionic models related to the one-dimensional Ising chain in the presence of a transverse field. These models are the Ising chain with anti-ferromagnetic long-range interactions that decay with distance r as ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn1.gif] $1/r^$backslash$alpha $ , as well as a related class of fermionic Hamiltonians that generalize the Kitaev chain, where both the hopping and pairing terms are long-range and their relative strength can be varied. For these models, we provide the phase diagram for all exponents $alpha$ , based on an analysis of the entanglement entropy, the decay of correlation functions, and the edge modes in the case of open chains. We demonstrate that violations of the area law can occur for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn2.gif] $$backslash$alpha $backslash$lesssim 1$ , while connected correlation functions can decay with a hybrid exponential and power-law behavior, with a power that is $alpha$ -dependent. Interestingly, for the fermionic models we provide an exact analytical derivation for the decay of the correlation functions at every $alpha$ . Along the critical lines, for all models breaking of conformal symmetry is argued at low enough $alpha$ . For the fermionic models we show that the edge modes, massless for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn3.gif] $$backslash$alpha $backslash$gtrsim 1$ , can acquire a mass for ##IMG## [http://ej.iop.org/images/1367-2630/18/1/015001/njpaa0ba8ieqn4.gif] $$backslash$alpha $backslash$lt 1$ . The mass of these modes can be tuned by varying the relative strength of the kinetic and pairing terms in the Hamiltonian. Interestingly, for the Ising chain a similar edge localization appears for the first and second excited states on the paramagnetic side of the phase diagram, where edge modes are not expected. We argue that, at least for the fermionic chains, these massive states correspond to the appearance of new phases, notably approached via quantum phase transitions without mass gap closure. Finally, we discuss the possibility to detect some of these effects in experiments with cold trapped ions.2015
Rogelio Díaz-Méndez, Fabio Mezzacapo, Fabio Cinti, Wolfgang Lechner, Guido Pupillo
Monodisperse Cluster Crystals: Classical and Quantum Dynamics Journal Article
In: Physical Review E, 92 (5), pp. 052307, 2015.
Abstract | Links | BibTeX | Tags:
@article{Diaz-Mendez2015,
title = {Monodisperse Cluster Crystals: Classical and Quantum Dynamics},
author = {Rogelio {Díaz-Méndez} and Fabio Mezzacapo and Fabio Cinti and Wolfgang Lechner and Guido Pupillo},
doi = {10.1103/PhysRevE.92.052307},
year = {2015},
date = {2015-11-01},
journal = {Physical Review E},
volume = {92},
number = {5},
pages = {052307},
abstract = {We study the phases and dynamics of a gas of monodisperse particles interacting via soft-core potentials in two spatial dimensions, which is of interest for soft-matter colloidal systems and quantum atomic gases. Using exact theoretical methods, we demonstrate that the equilibrium low-temperature classical phase simultaneously breaks continuous translational symmetry and dynamic space-time homogeneity, whose absence is usually associated with out-of-equilibrium glassy phenomena. This results in an exotic self-assembled cluster crystal with coexisting liquidlike long-time dynamical properties, which corresponds to a classical analog of supersolid behavior. We demonstrate that the effects of quantum fluctuations and bosonic statistics on cluster-glassy crystals are separate and competing: Zero-point motion tends to destabilize crystalline order, which can be restored by bosonic statistics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We study the phases and dynamics of a gas of monodisperse particles interacting via soft-core potentials in two spatial dimensions, which is of interest for soft-matter colloidal systems and quantum atomic gases. Using exact theoretical methods, we demonstrate that the equilibrium low-temperature classical phase simultaneously breaks continuous translational symmetry and dynamic space-time homogeneity, whose absence is usually associated with out-of-equilibrium glassy phenomena. This results in an exotic self-assembled cluster crystal with coexisting liquidlike long-time dynamical properties, which corresponds to a classical analog of supersolid behavior. We demonstrate that the effects of quantum fluctuations and bosonic statistics on cluster-glassy crystals are separate and competing: Zero-point motion tends to destabilize crystalline order, which can be restored by bosonic statistics.Wolfgang Lechner, Fabio Cinti, Guido Pupillo
Tunable Defect Interactions and Supersolidity in Dipolar Quantum Gases on a Lattice Potential Journal Article
In: Physical Review A, 92 (5), pp. 053625, 2015.
Abstract | Links | BibTeX | Tags:
@article{Lechner2015,
title = {Tunable Defect Interactions and Supersolidity in Dipolar Quantum Gases on a Lattice Potential},
author = {Wolfgang Lechner and Fabio Cinti and Guido Pupillo},
doi = {10.1103/PhysRevA.92.053625},
year = {2015},
date = {2015-11-01},
journal = {Physical Review A},
volume = {92},
number = {5},
pages = {053625},
abstract = {Point defects in self-assembled crystals, such as vacancies and interstitials, attract each other and form stable clusters. This leads to a phase separation between perfect crystalline structures and defect conglomerates at low temperatures. We propose a method that allows one to tune the effective interactions between point defects from attractive to repulsive by means of external periodic fields. In the quantum regime, this allows one to engineer strongly correlated many-body phases. We exemplify the microscopic mechanism by considering dipolar quantum gases of ground-state polar molecules and weakly bound molecules of strongly magnetic atoms trapped in a weak optical lattice in a two-dimensional configuration. By tuning the lattice depth, defect interactions turn repulsive, which allows us to deterministically design a novel supersolid phase in the continuum limit.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Point defects in self-assembled crystals, such as vacancies and interstitials, attract each other and form stable clusters. This leads to a phase separation between perfect crystalline structures and defect conglomerates at low temperatures. We propose a method that allows one to tune the effective interactions between point defects from attractive to repulsive by means of external periodic fields. In the quantum regime, this allows one to engineer strongly correlated many-body phases. We exemplify the microscopic mechanism by considering dipolar quantum gases of ground-state polar molecules and weakly bound molecules of strongly magnetic atoms trapped in a weak optical lattice in a two-dimensional configuration. By tuning the lattice depth, defect interactions turn repulsive, which allows us to deterministically design a novel supersolid phase in the continuum limit.Johannes Schachenmayer, Claudiu Genes, Edoardo Tignone, Guido Pupillo
Cavity-Enhanced Transport of Excitons Journal Article
In: Physical Review Letters, 114 (19), pp. 196403, 2015.
Abstract | Links | BibTeX | Tags:
@article{Schachenmayer2015,
title = {Cavity-Enhanced Transport of Excitons},
author = {Johannes Schachenmayer and Claudiu Genes and Edoardo Tignone and Guido Pupillo},
doi = {10.1103/PhysRevLett.114.196403},
year = {2015},
date = {2015-05-01},
journal = {Physical Review Letters},
volume = {114},
number = {19},
pages = {196403},
abstract = {We show that exciton-type transport in certain materials can be dramatically modified by their inclusion in an optical cavity: the modification of the electromagnetic vacuum mode structure introduced by the cavity leads to transport via delocalized polariton modes rather than through tunneling processes in the material itself. This can help overcome exponential suppression of transmission properties as a function of the system size in the case of disorder and other imperfections. We exemplify massive improvement of transmission for excitonic wave packets through a cavity, as well as enhancement of steady-state exciton currents under incoherent pumping. These results may have implications for experiments of exciton transport in disordered organic materials. We propose that the basic phenomena can be observed in quantum simulators made of Rydberg atoms, cold molecules in optical lattices, as well as in experiments with trapped ions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We show that exciton-type transport in certain materials can be dramatically modified by their inclusion in an optical cavity: the modification of the electromagnetic vacuum mode structure introduced by the cavity leads to transport via delocalized polariton modes rather than through tunneling processes in the material itself. This can help overcome exponential suppression of transmission properties as a function of the system size in the case of disorder and other imperfections. We exemplify massive improvement of transmission for excitonic wave packets through a cavity, as well as enhancement of steady-state exciton currents under incoherent pumping. These results may have implications for experiments of exciton transport in disordered organic materials. We propose that the basic phenomena can be observed in quantum simulators made of Rydberg atoms, cold molecules in optical lattices, as well as in experiments with trapped ions.M Dalmonte, W Lechner, Zi Cai, M Mattioli, A M Läuchli, G Pupillo
Cluster Luttinger Liquids and Emergent Supersymmetric Conformal Critical Points in the One-Dimensional Soft-Shoulder Hubbard Model Journal Article
In: Physical Review B, 92 (4), pp. 045106, 2015.
Abstract | Links | BibTeX | Tags:
@article{Dalmonte2015,
title = {Cluster Luttinger Liquids and Emergent Supersymmetric Conformal Critical Points in the One-Dimensional Soft-Shoulder Hubbard Model},
author = {M Dalmonte and W Lechner and Zi Cai and M Mattioli and A M Läuchli and G Pupillo},
doi = {10.1103/PhysRevB.92.045106},
year = {2015},
date = {2015-01-01},
journal = {Physical Review B},
volume = {92},
number = {4},
pages = {045106},
abstract = {We investigate the quantum phases of hard-core bosonic atoms in an extended Hubbard model where particles interact via soft-shoulder potentials in one dimension. Using a combination of field-theoretical methods and strong-coupling perturbation theory, we demonstrate that the low-energy phase can be a conformal cluster Luttinger liquid (CLL) phase with central charge c=1, where the microscopic degrees of freedom correspond to mesoscopic ensembles of particles. Using numerical density-matrix renormalization-group methods, we demonstrate that the CLL phase [first predicted in M. Mattioli et al., Phys. Rev. Lett. 111, 165302 (2013)] is separated from a conventional Tomonaga-Luttinger liquid by an exotic critical point with central charge c=32. The latter is expression of an emergent conformal supersymmetry, which is not present in the original Hamiltonian. We discuss the observability of the CLL phase in realistic experimental settings with weakly dressed Rydberg atoms confined to optical lattices. Using quantum Monte Carlo simulations, we show that the typical features of CLLs are stable up to comparatively high temperatures. Using exact diagonalizations and quantum trajectory methods, we provide a protocol for adiabatic state preparation as well as quantitative estimates on the effects of particle losses.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigate the quantum phases of hard-core bosonic atoms in an extended Hubbard model where particles interact via soft-shoulder potentials in one dimension. Using a combination of field-theoretical methods and strong-coupling perturbation theory, we demonstrate that the low-energy phase can be a conformal cluster Luttinger liquid (CLL) phase with central charge c=1, where the microscopic degrees of freedom correspond to mesoscopic ensembles of particles. Using numerical density-matrix renormalization-group methods, we demonstrate that the CLL phase [first predicted in M. Mattioli et al., Phys. Rev. Lett. 111, 165302 (2013)] is separated from a conventional Tomonaga-Luttinger liquid by an exotic critical point with central charge c=32. The latter is expression of an emergent conformal supersymmetry, which is not present in the original Hamiltonian. We discuss the observability of the CLL phase in realistic experimental settings with weakly dressed Rydberg atoms confined to optical lattices. Using quantum Monte Carlo simulations, we show that the typical features of CLLs are stable up to comparatively high temperatures. Using exact diagonalizations and quantum trajectory methods, we provide a protocol for adiabatic state preparation as well as quantitative estimates on the effects of particle losses.A Shalabney, J George, J Hutchison, G Pupillo, C Genet, T W Ebbesen
Coherent Coupling of Molecular Resonators with a Microcavity Mode Journal Article
In: Nature Communications, 6 , pp. 5981, 2015, ISSN: 2041-1723.
Abstract | Links | BibTeX | Tags:
@article{Shalabney2015,
title = {Coherent Coupling of Molecular Resonators with a Microcavity Mode},
author = {A Shalabney and J George and J Hutchison and G Pupillo and C Genet and T W Ebbesen},
doi = {10.1038/ncomms6981},
issn = {2041-1723},
year = {2015},
date = {2015-01-01},
journal = {Nature Communications},
volume = {6},
pages = {5981},
abstract = {The optical hybridization of the electronic states in strongly coupled molecule–cavity systems have revealed unique properties, such as lasing, room temperature polariton condensation and the modification of excited electronic landscapes involved in molecular isomerization. Here we show that molecular vibrational modes of the electronic ground state can also be coherently coupled with a microcavity mode at room temperature, given the low vibrational thermal occupation factors associated with molecular vibrations, and the collective coupling of a large ensemble of molecules immersed within the cavity-mode volume. This enables the enhancement of the collective Rabi-exchange rate with respect to the single-oscillator coupling strength. The possibility of inducing large shifts in the vibrational frequency of selected molecular bonds should have immediate consequences for chemistry.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The optical hybridization of the electronic states in strongly coupled molecule–cavity systems have revealed unique properties, such as lasing, room temperature polariton condensation and the modification of excited electronic landscapes involved in molecular isomerization. Here we show that molecular vibrational modes of the electronic ground state can also be coherently coupled with a microcavity mode at room temperature, given the low vibrational thermal occupation factors associated with molecular vibrations, and the collective coupling of a large ensemble of molecules immersed within the cavity-mode volume. This enables the enhancement of the collective Rabi-exchange rate with respect to the single-oscillator coupling strength. The possibility of inducing large shifts in the vibrational frequency of selected molecular bonds should have immediate consequences for chemistry.Publications
2022
Rise and fall, and slow rise again, of operator entanglement under dephasing Journal Article
In: Phys. Rev. Lett., 129 , pp. 170401, 2022.
Disorder enhanced vibrational entanglement and dynamics in polaritonic chemistry Journal Article
In: Commun. Phys. 5, 5 , pp. 120, 2022.
Large Random Arrowhead Matrices: Multifractality, Semi-Localization, and Protected Transport in Disordered Quantum Spins Coupled to a Cavity Journal Article
In: Phys. Rev. A, 105 , pp. 023714, 2022.
2021
A quantum optics approach to photoinduced electron transfer in cavities Journal Article
In: J. Chem. Phys., 154 (054104), 2021.
2020
Mobility edge of the two-dimensional Bose-Hubbard model Journal Article
In: Phys. Rev. Research, 2 , pp. 042037, 2020.
Collective Dissipative Molecule Formation in a Cavity Journal Article
In: Phys. Rev. Lett., 125 , pp. 193201, 2020.
Dark state semilocalization of quantum emitters in a cavity Journal Article
In: Phys. Rev. B, 102 , pp. 144202, 2020.
Adiabatic preparation of entangled, magnetically ordered states with cold bosons in optical lattices Journal Article
In: Quantum Sci. Technol., 5 , pp. 045013, 2020.
Dynamics of rotated spin states and magnetic ordering with two-component bosonic atoms in optical lattices Journal Article
In: Phys. Rev. A, 102 , pp. 023321, 2020.
Photon Blockade with Ground-State Neutral Atoms Journal Article
In: Phys. Rev. Lett., 125 , pp. 073601, 2020.
Adiabatic elimination for ensembles of emitters in cavities with dissipative couplings Journal Article
In: Phys. Rev. A , 102 , pp. 013714, 2020.
Ultrafast Creation of Overlapping Rydberg Electrons in an Atomic BEC and Mott-Insulator Lattice Journal Article
In: Phys. Rev. Lett., 124 , pp. 253201, 2020.
Nonequilibrium scenarios in cluster-forming quantum lattice models Journal Article
In: Phys. Rev. A, 101 , pp. 063603, 2020.
Universal Algebraic Growth of Entanglement Entropy in Many-Body Localized Systems with Power-Law Interactions Journal Article
In: Phys. Rev. Lett., 125 , pp. 010401, 2020.
Quantum cluster quasicrystals Journal Article
In: Phys. Rev. B, 101 , pp. 134522, 2020.
Ensemble-Induced Strong Light-Matter Coupling of a Single Quantum Emitter Journal Article
In: Phys. Rev. Lett., 124 , pp. 113602, 2020.
Collective excitation dynamics of a cold atom cloud Journal Article
In: Phys. Rev. A, 101 , pp. 013617, 2020.
2019
Collective Multimode Vacuum Rabi Splitting Journal Article
In: Phys. Rev. Lett., 123 , pp. 243401, 2019.
Doublon dynamics of Bose-Fermi mixtures in optical lattices Journal Article
In: Phys. Rev. A, 100 , pp. 053607, 2019.
Algebraic localization from power-law couplings in disordered quantum wires Journal Article
In: Phys. Rev. B, 100 , pp. 155136, 2019.
A generalized phase space approach for solving quantum spin dynamics Journal Article
In: New J. Phys. (fast track communication), 21 , pp. 082001, 2019.
Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice Journal Article
In: Phys. Rev. Lett., 123 , pp. 045301, 2019.
Exploring out-of-equilibrium quantum magnetism and thermalization in a spin-3 many-body dipolar lattice system Journal Article
In: Nature Communications, 10 (1714), 2019.
Supersolid Phases of Rydberg-Excited Bosons on a Triangular Lattice Journal Article
In: arXiv:1903.01912 [cond-mat], 2019.
Enhancement of the Electron–Phonon Scattering Induced by Intrinsic Surface Plasmon–Phonon Polaritons Journal Article
In: ACS Photonics, 2019.
Effects of energy extensivity on the quantum phases of long-range interacting systems Miscellaneous Forthcoming
Forthcoming.
One-dimensional extended Hubbard model with soft-core potential Miscellaneous Forthcoming
Forthcoming.
Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field Miscellaneous Forthcoming
Forthcoming.
2018
Enhancement of the Electron-Phonon Scattering Induced by Intrinsic Surface Plasmon-Phonon Polaritons Journal Article
In: arXiv:1810.10190 [cond-mat], 2018.
Algebraic Localization from Power-Law Interactions in Disordered Quantum Wires Journal Article
In: arXiv:1810.09779 [cond-mat, physics:quant-ph], 2018.
Phase-Change Switching in 2D via Soft Interactions Journal Article
In: arXiv:1808.07918 [cond-mat], 2018.
Cavity-Assisted Mesoscopic Transport of Fermions: Coherent and Dissipative Dynamics Journal Article
In: Physical Review B, 97 (20), pp. 205303, 2018.
2017
Cavity-Enhanced Transport of Charge Journal Article
In: Physical Review Letters, 119 (22), pp. 223601, 2017.
Rydberg Optical Feshbach Resonances in Cold Gases Journal Article
In: Physical Review A, 96 (3), pp. 032719, 2017.
Exploring many-body localization and thermalization using semiclassical methods Journal Article
In: Phys. Rev. A, 96 , pp. 033604, 2017.
Glass Transitions in Monodisperse Cluster-Forming Ensembles: Vortex Matter in Type-1.5 Superconductors Journal Article
In: Physical Review Letters, 118 (6), pp. 067001, 2017.
2016
Effective Theory and Breakdown of Conformal Symmetry in a Long-Range Quantum Chain Journal Article
In: Annals of Physics, 374 , pp. 35-66, 2016, ISSN: 0003-4916.
Cavity Polaritons with Rydberg Blockade and Long-Range Interactions Journal Article
In: Journal of Physics B: Atomic, Molecular and Optical Physics, 49 (16), pp. 164006, 2016, ISSN: 0953-4075.
Event-Driven Monte Carlo: Exact Dynamics at All Time Scales for Discrete-Variable Models Journal Article
In: EPL (Europhysics Letters), 114 (5), pp. 50003, 2016, ISSN: 0295-5075.
Broadband Photon-Photon Interactions Mediated by Cold Atoms in a Photonic Crystal Fiber Journal Article
In: Scientific Reports, 6 , pp. 25630, 2016, ISSN: 2045-2322.
Cluster Bose Metals Journal Article
In: arXiv:1606.04267 [cond-mat], 2016.
Direct Observation of Ultrafast Many-Body Electron Dynamics in an Ultracold Rydberg Gas Journal Article
In: Nature Communications, 7 , pp. 13449, 2016, ISSN: 2041-1723.
Superglass Phase of Interaction-Blockaded Gases on a Triangular Lattice Journal Article
In: Physical Review Letters, 116 (13), pp. 135303, 2016.
Two Holes in a Two-Dimensional Quantum Antiferromagnet: A Variational Study Based on Entangled-Plaquette States Journal Article
In: Physical Review B, 94 (15), pp. 155120, 2016.
Long-Range Ising and Kitaev Models: Phases, Correlations and Edge Modes Journal Article
In: New Journal of Physics, 18 (1), pp. 015001, 2016, ISSN: 1367-2630.
2015
Monodisperse Cluster Crystals: Classical and Quantum Dynamics Journal Article
In: Physical Review E, 92 (5), pp. 052307, 2015.
Tunable Defect Interactions and Supersolidity in Dipolar Quantum Gases on a Lattice Potential Journal Article
In: Physical Review A, 92 (5), pp. 053625, 2015.
Cavity-Enhanced Transport of Excitons Journal Article
In: Physical Review Letters, 114 (19), pp. 196403, 2015.
Cluster Luttinger Liquids and Emergent Supersymmetric Conformal Critical Points in the One-Dimensional Soft-Shoulder Hubbard Model Journal Article
In: Physical Review B, 92 (4), pp. 045106, 2015.
Coherent Coupling of Molecular Resonators with a Microcavity Mode Journal Article
In: Nature Communications, 6 , pp. 5981, 2015, ISSN: 2041-1723.