Equilibrium angular momentum and edge current in Bose-condensed cold atom systems with k-space Berry curvature

TL;DR

This paper investigates how Bose-condensed cold atoms in a 2D optical lattice with non-zero Berry curvature exhibit temperature-dependent angular momentum and edge currents, combining analytical and numerical methods.

Contribution

It reveals the existence of non-universal, temperature-dependent equilibrium angular momentum and edge currents in Bose-condensed systems with Berry curvature, a novel insight.

Findings

Angular momentum depends on temperature and system parameters.

Edge current exists at low temperatures due to Berry curvature.

Results are supported by both analytical and numerical analyses.

Abstract

In this paper we study the properties of cold bosons in a two-dimensional optical lattice system where Bose-condensation occurs at a momentum point k with non-zero k-space Berry curvature. By combining results from both analytic and numerical approaches, we show that the boson system carries non-universal, temperature dependent equilibrium angular momentum and edge current at low temperatures.