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arXiv · 1802.08763

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

Michikazu Kobayashi·Minoru Eto·Muneto Nitta
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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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Michikazu Kobayashi, Minoru Eto, Muneto Nitta. 2018-02-23. Berezinskii-Kosterlitz-Thouless transition of two-component Bose mixtures with inter-component Josephson coupling. https://doi.org/10.1103/physrevlett.123.075303

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