Stability of superfluid and supersolid phases of dipolar bosons in optical lattices

TL;DR

This paper analyzes the stability and phase boundaries of superfluid and supersolid phases of dipolar bosons in 2D optical lattices, revealing tunable phase transitions including checkerboard and striped supersolids.

Contribution

It provides a detailed stability analysis and phase diagram for dipolar bosons, highlighting how external fields can control phase transitions between different supersolid states.

Findings

Identified phase boundaries between SF, CSS, SSS, and collapse.

Demonstrated control of phase transitions via external field orientation.

Found a transition between checkerboard and striped supersolid phases.

Abstract

We perform a stability analysis of superfluid (SF) and supersolid (SS) phases of polarized dipolar bosons in two-dimensional optical lattices at high filling factors and zero temperature, and obtain the phase boundaries between SF, checkerboard SS (CSS), striped SS (SSS), and collapse. We show that the phase diagram can be explored through the application of an external field and the tuning of its direction with respect to the optical lattice plane. In particular, we find a transition between the CSS and SSS phases.