Mixtures of Bose Gases Confined in a Ring Potential

TL;DR

This paper investigates the rotational behavior of two-component Bose gases in a ring potential, revealing conditions for stable persistent currents and their fragility at higher angular momenta.

Contribution

It demonstrates the stability conditions of persistent currents in two-component Bose gases and analyzes their fragility at increased angular momentum.

Findings

Persistent currents are stable at low angular momentum for certain population imbalances.

Small admixtures of a second species destabilize persistent currents at higher angular momentum.

The study highlights the impact of population imbalance and angular momentum on superfluid stability.

Abstract

The rotational properties of a mixture of two distinguishable Bose gases that are confined in a ring potential provide novel physical effects that we demonstrate in this study. Persistent currents are shown to be stable for a range of the population imbalance between the two components at low angular momentum. At higher values of the angular momentum, even small admixtures of a second species of atoms make the persistent currents highly fragile.