Berezinskii-Kosterlitz-Thouless transition of two-component Bose mixtures with inter-component Josephson coupling

2018/02/28 by Michikazu Kobayashi, Minoru Eto, Muneto Nitta · 1 citation
Physics and Astronomy · #cond-mat.stat-mech #cond-mat.supr-con #hep-th

paper · pdf · doi:10.1103/physrevlett.123.075303

published as Phys. Rev. Lett. 123, 075303 (2019) · 11 pages, 9 figures

arxiv created 2019/08/21 · arxiv updated 2019/08/22

Abstract

We study the Berezinskii-Kosterlitz-Thouless (BKT) transition of two-component Bose mixtures in two spatial dimensions. When phases of both components are decoupled, half-quantized vortex-antivortex pairs of each component induce two-step BKT transitions. On the other hand, when phases of the both components are synchronized through the inter-component Josephson coupling, two species of vortices of each component are bind to form a molecule, and in this case, we find that there is only one BKT transition by molecule-antimolecule pairs. Our results can be tested by two weakly-connected Bose systems such as two-component ultracold dilute Bose mixtures with the Rabi oscillation, and multiband superconductors.

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