Persistent currents in Bose gases confined in annular traps

TL;DR

This paper investigates the stability of persistent currents in two-component Bose gases confined in annular traps, focusing on how dimensionality and population imbalance affect metastability thresholds.

Contribution

It provides a detailed analysis of critical coupling values for metastability in mixed Bose gases, considering both dimensional crossover and population imbalance effects.

Findings

Critical coupling for metastability depends on dimensionality

Population imbalance influences current stability thresholds

Stability is sensitive to deviations from one-dimensional motion

Abstract

We examine the problem of stability of persistent currents in a mixture of two Bose gases trapped in an annular potential. We evaluate the critical coupling for metastability in the transition from quasi-one to two-dimensional motion. We also evaluate the critical coupling for metastability in a mixture of two species as function of the population imbalance. The stability of the currents is shown to be sensitive to the deviation from one-dimensional motion.