Mixtures of Bose gases confined in concentrically coupled annular traps

TL;DR

This paper investigates the quantum phase transitions, ground-state phase diagram, and rotational properties of a two-component Bose-Einstein condensate confined in concentric annular traps, revealing complex phase behaviors and stability conditions.

Contribution

It introduces a detailed analysis of phase transitions and stability in a two-component BEC within concentric annular traps, highlighting new quantum phenomena and phase behaviors.

Findings

Multiple quantum phase transitions identified

Ground-state phase diagram mapped out

Stability analysis of persistent currents conducted

Abstract

A two-component Bose-Einstein condensate confined in an axially-symmetric potential with two local minima, resembling two concentric annular traps, is investigated. The system shows a number of quantum phase transitions that result from the competition between phase coexistence, and radial/azimuthal phase separation. The ground-state phase diagram, as well as the rotational properties, including the (meta)stability of currents in this system, are analysed.