Time reversal symmetry breakdown in normal and superconducting states in frustrated three-band systems

被引：54

作者：

Bojesen, Troels Arnfred ^{[1
]}

Babaev, Egor ^{[2
,3
]}

Sudbo, Asle ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway

[2] Royal Inst Technol, Dept Theoret Phys, S-10691 Stockholm, Sweden

[3] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 22期

基金：

瑞典研究理事会; 美国国家科学基金会;

关键词：

2-BAND SUPERCONDUCTORS;

D O I：

10.1103/PhysRevB.88.220511

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We discuss the phase diagram and phase transitions in U(1) x Z(2) three-band superconductors with broken time reversal symmetry. We find that beyond mean-field approximation and for sufficiently strong frustration of interband interactions there appears an unusual metallic state precursory to a superconducting phase transition. In that state, the system is not superconducting. Nonetheless, it features a spontaneously broken Z(2) time reversal symmetry. By contrast, for weak frustration of interband coupling the energy of a domain wall between different Z(2) states is low and thus fluctuations restore broken time reversal symmetry in the superconducting state at low temperatures.

引用

页数：4

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