A binary mixture of Bose-Einstein-condensates in a double-well potential: Berry phase and two-mode entanglement

TL;DR

This paper investigates the quantum phase transition in a binary Bose-Einstein condensate mixture within a double-well potential, highlighting the role of Berry phase and two-mode entanglement near criticality.

Contribution

It introduces an effective Hamiltonian approach with Holstein-Primakoff transformation to analyze the transition, revealing the connection between Berry phase and quantum phase transition, and demonstrating entanglement emergence.

Findings

Presence of non-trivial Berry phase near critical coupling

Entanglement accompanies the phase transition in large particle limit

Effective Hamiltonian captures the miscibility-immiscibility transition

Abstract

A binary mixtures of Bose-Einstein condensate structures exhibit an incredible richness in terms of holding different kinds of phases. Depending on the ratio of the inter- and intra-atomic interactions, the transition from mixed to separated phase, which is also known as the miscibility-immiscibility transition, has been reported in different setups and by different groups. Here, we describe such type of quantum phase transition in an effective Hamiltonian approach, by applying Holstein-Primakoff transformation in the limit of large number of particles. We demonstrate that non-trivial geometric phase near the critical coupling is present, which confirms the connection between Berry phase and quantum phase transition. We also show that, by using the spin form of Hillery & Zubairy criterion, a two mode entanglement accompanies this transition in the limit of large, but not infinite number of particles.