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arXiv 2206.04474cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
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多元超导体的磁拓扑转变

Magneto-topological transitions in multicomponent superconductors

Yuriy Yerin, Stefan-Ludwig Drechsler, Mario Cuoco, Caterina Petrillo

摘要:

具有竞争性0-和$π$ -配对耦合的多组分自旋单线态超导体,如在$s_{++}$和$s_{\pm}$相中,接近于具有时间反演对称性自发破缺的不稳定性。我们表明,修改的动能的超导电子在一个双连接的超导圆柱体,所施加的磁通量,通常驱动器从手征超导态的时间反演对称的配置的过渡。这种磁拓扑诱导的转换研究通过一个Ginzburg-Landau的方法与带间相互作用和杂质散射的情况下的样品的形式的介观薄壁圆筒的两个带超导体的调查。我们发现,应用磁通量可以将手性$s_{\pm}+is_{++}$状态转换为$s_{\pm}$配置,反之亦然,或调谐具有不等配对振幅的手性状态的能量分裂。我们讨论了这些阶段的检测和相应的过渡介观超导回路的签名。

英文摘要:

Multi-component spin-singlet superconductors with competing 0- and $π$-pairing couplings, as in $s_{++}$ and $s_{\pm}$ phases, are close to instabilities with a spontaneous breaking of time-reversal symmetry. We demonstrate that the modification of the kinetic energy of superconducting electrons in a doubly connected superconducting cylinder, determined by the applied flux, generally drives transitions from chiral superconducting states to configurations that are time-reversal symmetric. This magneto-topological-induced changeover is investigated by means of a Ginzburg-Landau approach for a two-band superconductor with interband interactions and impurity scattering investigated for the case of a sample in the form of a mesoscopically thin-walled cylinder. We find that the application of a magnetic flux can convert a chiral $s_{\pm}+is_{++}$ state into a $s_{\pm}$ configuration and vice versa or tune the energy splitting of chiral states having inequivalent pairing amplitudes. We discuss signatures for the detection of these phases and of the corresponding transitions in mesoscopic superconducting loops.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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