Phase separation in binary Bose mixtures at finite temperature

TL;DR

This study uses advanced Monte-Carlo simulations to analyze the magnetic behavior and phase separation conditions of finite-temperature binary Bose mixtures, challenging previous theoretical predictions.

Contribution

It introduces novel algorithms for calculating free energy and chemical potential, providing more accurate insights into phase separation at finite temperatures.

Findings

Phase separation conditions are unchanged from zero temperature.

Results contradict previous approximate theories.

Temperature dependence of chemical potential and contact parameters is characterized.

Abstract

We investigate the magnetic behavior of finite-temperature repulsive two-component Bose mixtures by means of exact path-integral Monte-Carlo simulations. Novel algorithms are implemented for the free energy and the chemical potential of the two components. Results on the magnetic susceptibility suggest that the conditions for phase separation are not modified from the zero temperature case. This contradicts previous predictions based on approximate theories. We also determine the temperature dependence of the chemical potential and the contact parameters for experimentally relevant balanced mixtures.