Coupled superfluidity of binary Bose mixtures in two dimensions

Abstract

We consider a two-component Bose gas in two dimensions at low temperature with short-range repulsive interaction. In the coexistence phase where both components are superfluid, inter-species interactions induce a nondissipative drag between the two superfluid flows (Andreev-Bashkin effect). We show that this behavior leads to a modification of the usual Berezinskii-Kosterlitz-Thouless (BKT) transition in two dimensions. We extend the renormalization of the superfluid densities at finite temperature using the renormalization group approach and find that the vortices of one component have a large influence on the superfluid properties of the other, mediated by the nondissipative drag. The extended BKT flow equations indicate that the occurrence of the vortex unbinding transition in one of the components can induce the breakdown of superfluidity also in the other, leading to a locking phenomenon for the critical temperatures of the two gases.

12 Pages, 7 Figures

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• Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
• Linear response study of collisionless spin drag
• Berezinskii-Kosterlitz-Thouless phase transition with Rabi-coupled bosons
• Functional renormalization for repulsive Bose-Bose mixtures at zero temperature
• Weakly-interacting Bose-Bose mixtures from the functional renormalisation group
• Spin and Density Modes in a Binary Fluid of Light
• Large-$N$ expansion for condensation and stability of Bose-Bose mixtures at finite temperatures
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• Spin conductivity spectrum and spin superfluidity in a binary Bose mixture
• Observation of a Bilayer Superfluid with Interlayer Coherence
• Signature of Andreev-Bashkin superfluid drag from Cavity Optomechanics
• Superfluidity and coherence in uniform dipolar binary Bose mixtures
• Resonantly enhanced superconductivity mediated by spinor condensates
• Superconductor-polariton non-dissipative drag in optical microcavity
• Preparation of quasi-two-dimensional Bose mixture of ultracold ${}^{23}$Na and ${}^{87}$Rb atoms