2000 character limit reached
Berezinskii-Kosterlitz-Thouless transition of two-component Bose mixtures with inter-component Josephson coupling (1802.08763v2)
Published 23 Feb 2018 in cond-mat.stat-mech, cond-mat.supr-con, and hep-th
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.