The role of inter-well tunneling strength on coherence dynamics of two-species Bose-Einstein condensates

TL;DR

This paper studies how inter-well tunneling strength affects the coherence dynamics of two-species Bose-Einstein condensates, revealing decoherence phenomena and proposing control methods via time-dependent tunneling.

Contribution

It demonstrates that coherence can decay without environmental coupling and introduces a method to control coherence using time-dependent tunneling strength.

Findings

Decoherence occurs even without environment coupling.

Coherence dynamics depend on system parameters and initial states.

Time-dependent tunneling can be used to achieve desired coherence levels.

Abstract

Coherence dynamics of two-species Bose-Einstein condensates in double wells is investigated in mean field approximation. We show that the system can exhibit decoherence phenomena even without the condensate-environment coupling and the variation tendency of the degree of coherence depends on not only the parameters of the system but also the initial states. We also investigate the time evolution of the degree of coherence for a Rosen-Zener form of tunneling strength, and propose a method to get a condensate system with certain degree of coherence through a time-dependent tunneling strength.