Magnetic Phase Transition in a Mixture of Two Interacting Superfluid Bose Gases at Finite Temperature

Year: 2019

Authors: Ota M., Giorgini S., Stringari S.

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

Abstract: The miscibility condition for a binary mixture of two interacting Bose-Einstein condensates is shown to be deeply affected by interaction driven thermal fluctuations. These give rise to a first order phase transition to a demixed phase with full spatial separation of the two condensates, even if the mixture is miscible at zero temperature. Explicit predictions for the isothermal compressibility, the spin susceptibility, and the phase transition temperature T-M are obtained in the framework of Popov theory, which properly includes beyond mean-field quantum and thermal fluctuations in both the spin and density channels. For a mixture of two sodium condensates occupying the hyperfine states vertical bar F = 1 >, vertical bar m(F) = 1 > and vertical bar F = 1, m(F) = -1 >, respectively, T-M is predicted to occur at about 0.7 times the usual BEC critical temperature.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 123 (7)      Pages from: 075301-1  to: 075301-5

More Information: 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 gases; magnetic susceptibility; Bose-Einstein condensates
DOI: 10.1103/PhysRevLett.123.075301

Citations: 27
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