Phase diagram of two-component mean-field Bose mixtures

TL;DR

This paper analyzes the phase diagram of two-component mean-field Bose mixtures at finite temperatures, revealing how interspecies interactions influence phase transitions, including Bose-Einstein condensation, collapse, and liquid-gas transitions, with analytical insights into their structure.

Contribution

It provides a comprehensive analytical study of the phase diagram of two-component Bose mixtures, highlighting the effects of interspecies interactions and identifying conditions for various phase transition points.

Findings

Weak interspecies interactions lead to quadruple points without triple or tricritical points.

Strong positive interspecies interactions produce triple and tricritical points but no quadruple points.

Conditions for liquid-gas type transitions in the mixture are clarified.

Abstract

We revisit the structure of the phase diagram of the two-component mean-field Bose mixture at finite temperatures, considering both the cases of attractive and repulsive interspecies interactions. In particular, we analyze the evolution of the phase diagram upon driving the system towards collapse and point out its distinctive features in this limit. We provide analytical insights into the global structure of the phase diagram and the properties of the phase transitions between the normal phase and the phases involving Bose-Einstein condensates. \emph{Inter alia} we analytically demonstrate that for sufficiently weak interspecies interactions $a_{12}$ the system generically exhibits a line of quadruple points but has no triple nor tricritical points in the phase diagram spanned by the chemical potentials $\mu_1$, $\mu_2$ and temperature $T$. In contrast, for sufficiently large, positive values of $a_{12}$, the system displays both triple and tricritical points but no quadruple points. As pointed out in recent studies, in addition to the phase transitions involving condensation, the mixture may be driven through a liquid-gas type transition, and we clarify the conditions for its occurrence. We finally discuss the impact of interaction- and mass-imbalance on the phase diagram of the mixture.