Enhancement of the Bose glass phase in the presence of an artificial gauge field

TL;DR

This study investigates how an artificial gauge field and finite temperature influence the disordered Bose-Hubbard model, revealing that the gauge field enhances the Bose glass phase, which can be tuned by its strength, with implications for experiments.

Contribution

It demonstrates that an artificial gauge field enlarges and tunes the Bose glass phase in a disordered Bose-Hubbard model, using Gutzwiller mean-field theories for analysis.

Findings

Artificial gauge field enhances Bose glass domain.

Size of Bose glass domain can be tuned with gauge field strength.

Cluster Gutzwiller method provides more reliable results.

Abstract

We examine the effects of an artificial gauge field and finite temperature in a two-dimensional disordered Bose-Hubbard model. The disorder considered is diagonal and quenched in nature. A signature of disorder in the Bose-Hubbard model is the Bose glass phase. Our work shows that the introduction of an artificial gauge field enhances the domain of the Bose glass phase in the phase diagram. Most importantly, the size of the domain can be tuned with the strength of the artificial gauge field. The introduction of the finite temperature effects is essential to relate theoretical results with the experimental realizations. For our studies we use the single site and cluster Gutzwiller mean-field theories. The results from the latter are more reliable as it better describes the correlation effects. Our results show that the Bose glass phase has a larger domain with the latter method.