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arXiv 1211.4342cond-mat.supr-conhep-phhep-thmath-phmath.MP
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三带超导体中的手征CP ^2 Skyrmion

Chiral CP^2 skyrmions in three-band superconductors

Julien Garaud, Johan Carlstrom, Egor Babaev, Martin Speight

摘要:

研究表明,在一定条件下,三分量超导体(特别是三带系统)允许存在不同于涡旋的稳定拓扑缺陷。我们证明了这些激发的存在,其特征在于由一个$CP^2$拓扑不变,在模型中的三组分超导体的时间反演对称性破缺。我们将这些拓扑缺陷称为“手性$GL^{(3)}$ skyrmions”,其中“手性”是指由于时间反演对称性破缺,这些缺陷具有不等价的左手和右手版本。在某些情况下,这些物体在能量上比涡旋便宜,并且应该由所施加的磁场引起。在其他情况下,这些skyrmions是亚稳态,可以通过猝灭产生。这些缺陷的观察可以在三带超导体或$s_\pm$和s波超导体的约瑟夫森耦合双层中发出时间反演对称性破缺的信号。

英文摘要:

It is shown that under certain conditions, three-component superconductors (and in particular three-band systems) allow stable topological defects different from vortices. We demonstrate the existence of these excitations, characterized by a $CP^2$ topological invariant, in models for three-component superconductors with broken time reversal symmetry. We term these topological defects "chiral $GL^{(3)}$ skyrmions", where "chiral" refers to the fact that due to broken time reversal symmetry, these defects come in inequivalent left- and right-handed versions. In certain cases these objects are energetically cheaper than vortices and should be induced by an applied magnetic field. In other situations these skyrmions are metastable states, which can be produced by a quench. Observation of these defects can signal broken time reversal symmetry in three-band superconductors or in Josephson-coupled bilayers of $s_\pm$ and s-wave superconductors.

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