Phase Separation in two-Species Atomic Bose-Einstein Condensate with Interspecies Feshbach Resonance

TL;DR

This paper investigates phase separation phenomena in a two-species atomic Bose-Einstein condensate system coupled via interspecies Feshbach resonance, revealing complex phase behaviors influenced by Feshbach coupling and particle interactions.

Contribution

It introduces a detailed analysis of phase separation and coexistence in a coupled two-species BEC system with Feshbach resonance, highlighting new phase possibilities.

Findings

Existence of pure molecular and atomic superfluids as distinct phases

Support for complex phase separations including atom-molecule phase boundaries

Influence of Feshbach coupling and collisions on system miscibility

Abstract

We consider a mixture of two-species atomic Bose-Einstein codensates coupled to a bound molecular state at zero temperature via interspecies Feshbach resonance. The interspecies Feshbach coupling precludes the possibility of doubly mixed phases while enables not only the pure molecular superfluid but also the pure atomic superfluids to exist as distinct phases. We show that this system is able to support a rich set of phase separations, including that between two distinct mixed atom-molecule phases. We pay particular attention to the effects of the Feschbach coupling and the particle collisions on the miscibility of this multi-component condensate system.