The influence of sublattice bias on superfluid to Mott insulator transitions

TL;DR

This paper investigates how sublattice bias affects the superfluid to Mott insulator transition in a Bose gas on a lattice, revealing phase diagram modifications and experimental signatures.

Contribution

It introduces a model for Bose gases on inequivalent sublattices and analyzes the impact of sublattice bias on phase transitions using the Gutzwiller ansatz.

Findings

Mott lobes split due to sublattice bias

Phase diagrams show altered superfluid-Mott insulator boundaries

Experimental signatures of sublattice effects identified

Abstract

We model the superfluid to Mott insulator transition for a Bose gas on a lattice with two inequivalent sublattices. Using the Gutzwiller ansatz, we produce phase diagrams and provide an understanding of the interplay between superfluidity on each sublattice. We explore how the Mott lobes split, and describe the experimental signatures.