Thermal suppression of phase separation in condensate mixtures

TL;DR

This paper investigates how thermal fluctuations influence phase separation in binary Bose-Einstein condensates, showing that finite temperature suppresses phase separation due to interactions with thermal atoms, and proposes a way to distinguish phases via correlation functions.

Contribution

It demonstrates the suppression of phase separation at finite temperatures using Hartree-Fock-Bogoliubov theory with Popov approximation, highlighting thermal effects on condensate behavior.

Findings

Phase separation is suppressed at non-zero temperature.

Thermal cloud interactions influence condensate phase behavior.

Correlation functions can distinguish phases at finite temperature.

Abstract

We examine the role of thermal fluctuations in binary condensate mixtures of dilute atomic gases. In particular, we use Hartree-Fock-Bogoliubov with Popov approximation to probe the impact of non-condensate atoms to the phenomenon of phase-separation in two-component Bose-Einstein condensates. We demonstrate that, in comparison to $T=0$, there is a suppression in the phase-separation of the binary condensates at $T\neq0$. This arises from the interaction of the condensate atoms with the thermal cloud. We also show that, when $T\neq0$ it is possible to distinguish the phase-separated case from miscible from the trends in the correlation function. However, this is not the case at $T=0$.