Berezinskii-Kosterlitz-Thouless Transition of Two-Component Bose Mixtures with Intercomponent Josephson Coupling

被引：37

作者：

Kobayashi, Michikazu ^{[1
]}

Eto, Minoru ^{[2
,3
,4
]}

Nitta, Muneto ^{[3
,4
]}

机构：

[1] Kyoto Univ, Dept Phys, Sakyo Ku, Oiwake Cho, Kyoto 6068502, Japan

[2] Yamagata Univ, Dept Phys, Kojirakawa Machi 1-4-12, Yamagata, Yamagata 9908560, Japan

[3] Keio Univ, Dept Phys, Hiyoshi 4-1-1, Yokohama, Kanagawa, Japan

[4] Keio Univ, Res & Educ Ctr Nat Sci, Hiyoshi 4-1-1, Yokohama, Kanagawa, Japan

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 07期

基金：

日本学术振兴会;

关键词：

HALF-QUANTUM VORTICES; LONG-RANGE ORDER; PHASE-TRANSITIONS; MGB2;

D O I：

10.1103/PhysRevLett.123.075303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 both components are synchronized through the intercomponent Josephson coupling, two species of vortices of each component are bound 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 diluted Bose mixtures with the Rabi oscillation, and multiband superconductors.

引用

页数：6

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