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arXiv 2103.06282cond-mat.supr-con
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交错排列Rashba超导体的自旋响应和拓扑

Spin response and topology of a staggered Rashba superconductor

Anastasiia Skurativska, Manfred Sigrist, Mark H. Fischer

摘要:

反转对称性是非常规超导体中的一个关键对称性,甚至它的局部破缺也会产生深远的影响。对于反转对称系统,有一个微观层面上的自旋轨道耦合与本地缺乏反转和杂交条款,“恢复”反转之间的竞争。研究了具有交替镜像对称破缺的层状系统,在强自旋轨道耦合的情况下,考虑了不同超导序参量的自旋响应,研究了这种竞争.我们发现,签名的本地非中心对称性,如自旋单重态超导体的$T\rightarrow 0$的自旋磁化率增加,坚持甚至到准三维制度。这导致方向相关的自旋响应,从而可以区分不同的超导序参量。此外,我们在对称指标分析中确定了几个可能具有拓扑超导相的区域。我们的研究结果可能有直接的相关性,最近报道的铈基超导体CeRh $_2$作为$_2$和超越。

英文摘要:

Inversion symmetry is a key symmetry in unconventional superconductors and even its local breaking can have profound implications. For inversion-symmetric systems, there is a competition on a microscopic level between the spin-orbit coupling associated with the local lack of inversion and hybridizing terms that `restore' inversion. Investigating a layered system with alternating mirror-symmetry breaking, we study this competition considering the spin response of different superconducting order parameters for the case of strong spin-orbit coupling. We find that signatures of the local non-centrosymmetry, such as an increased spin susceptibility in spin-singlet superconductors for $T\rightarrow 0$, persist even into the quasi-three-dimensional regime. This leads to a direction dependent spin response which allows to distinguish different superconducting order parameters. Furthermore, we identify several regimes with possible topological superconducting phases within a symmetry-indicator analysis. Our results may have direct relevance for the recently reported Ce-based superconductor CeRh$_2$As$_2$ and beyond.

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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