Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice: new publication on Physical Review Letters

Long-range interactions and superstripe formation are hot topics of research in AMO and many-body lattice physics, where long-range interactions present unique theoretical challenges. We investigated a rather generic extended Hubbard model for bosons on a lattice with interactions interpolating between short- and infinite-range allowing for exact solutions by quantum Monte Carlo methods. We predict a novel type of stripe crystal at strong coupling. Most interestingly, for intermediate interaction strengths the stripes can turn superfluid into a self-assembled array of quasi-one-dimensional superfluids (bosonic superstripes) reminiscent of classical soft-matter models, different from the mechanisms that have generated much interest in recent years.

This work has now been published in Physical Review Letters: Physical Review Letters 123, 045301 (2019).

Ground state (GS) phase diagram of model studied as a function of the interaction strength [panel (a)]. For increasing values of the GS is a superfluid (SF), an isotropic supersolid (IS), an anisotropic stripe supersolid (SS) and stripe crystal (SC) (see text). Panels (b), (c), (d), (e) show site-density maps of a portion of the system for representative interaction strengths at which the GS is a SF, IS, SS, and SC, respectively. The size of the dots is proportional to the occupation of the corresponding sites.
Guido Masella, Adriano Angelone, Fabio Mezzacapo, Guido Pupillo, Nikolay V Prokofév: Supersolid Stripe Crystal from Finite-Range Interactions on a Lattice. In: Phys. Rev. Lett., 123 , pp. 045301, 2019.