Mean field analysis of quantum phase transitions in a periodic optical superlattice

TL;DR

This paper uses mean field theory to analyze phase transitions in ultracold bosons within a periodic optical superlattice, identifying superfluid and various insulator phases across different densities.

Contribution

It provides a detailed mean field analysis of quantum phase transitions in optical superlattices, highlighting the coexistence of superfluid and multiple insulator phases.

Findings

Identification of superfluid and insulator phases

Observation of density wave order in insulators

Analysis across a wide range of densities

Abstract

In this paper we analyze the various phases exhibited by a system of ultracold bosons in a periodic optical superlattice using the mean field decoupling approximation. We investigate for a wide range of commensurate and incommensurate densities. We find the gapless superfluid phase, the gapped Mott insulator phase, and gapped insulator phases with distinct density wave orders.