Phase diagram of hard core bosons with anisotropic interactions

TL;DR

This paper maps the phase diagram of hard core bosons with anisotropic interactions, revealing superfluid and crystalline phases, but no supersolid phase, using Quantum Monte Carlo simulations.

Contribution

It provides the first detailed phase diagram for anisotropic interactions in hard core bosons, highlighting the effects of directional interaction variation.

Findings

Superfluid phase observed.

Checkerboard and striped crystalline phases identified.

No supersolid phase detected.

Abstract

The phase diagram of lattice hard core bosons with nearest-neighbor interactions allowed to vary independently, from repulsive to attractive, along different crystallographic directions, is studied by Quantum Monte Carlo simulations. We observe a superfluid phase, as well as two crystalline phases at half filling, either checkerboard or striped. Just like in the case of isotropic interactions, no supersolid phase is observed.