Magnetic Phase Transition in a Mixture of Two Interacting Superfluid Bose Gases at Finite Temperature
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
KeyWords: Bose-Einstein condensatesDOI: 10.1103/PhysRevLett.123.075301Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-06-28References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here