Thermodynamics of dilute Bose gases: Beyond mean-field theory for binary mixtures of Bose-Einstein condensates

Year: 2020

Authors: Ota M., Giorgini S.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Trento, Italy; Univ Trento, Dipartimento Fis, I-38123 Trento, Italy.

Abstract: We study the thermodynamic properties of binary Bose mixtures by developing a beyond mean-field Popov theory which properly includes the effects of quantum and thermal fluctuations in both the density and spin channels. Results for key thermodynamic quantities, such as the isothermal compressibility and the magnetic susceptibility, are derived from a perturbative calculation of the grand-canonical potential. We find that thermal fluctuations can play a crucial role on the miscibility condition of a binary mixture, favoring phase separation at finite temperature even if the mixture is soluble at zero temperature, as already anticipated in a previous work [M. Ota et al., Phys. Rev. Lett. 123, 075301 (2019)]. We further investigate the miscibility condition for binary mixtures in the presence of asymmetry in the intraspecies interactions, as well as in the masses of the two components. Furthermore, we discuss the superfluid behavior of the mixture and the temperature dependence of the Andreev-Bashkin effect.

Journal/Review: PHYSICAL REVIEW A

Volume: 102 (6)      Pages from: 063303-1  to: 063303-16

More Information: We are indebted to S. Stringari for many stimulating discussions and suggestions during the preparation of this work. We also thank D. Romito for useful comments. This project has received funding from the EU Horizon 2020 research and innovation programme under Grant Agreement No. 641122 QUIC, and by Provincia Autonoma di Trento.
KeyWords: Bose mixtures; thermodynamic
DOI: 10.1103/PhysRevA.102.063303

Citations: 16
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