arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.15775cond-mat.supr-concond-mat.str-el
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中心对称反铁磁金属中奇宇称自旋三重态超导电性

Odd-Parity Spin-Triplet Superconductivity in Centrosymmetric Antiferromagnetic Metals

Seung Hun Lee, Bohm-Jung Yang

摘要:

提出了一种在具有反转对称性的金属共线反铁磁体中实现奇宇称自旋三重态超导的途径。由于反么正对称性的存在,我们称之为有效时间反演对称性(eTRS),普通反铁磁金属的费米面通常是自旋简并的,自旋单重态配对是有利的。然而,通过引入一个局部反演对称性破缺微扰,也打破了eTRS,我们可以解除简并获得自旋极化费米表面。在弱耦合极限下,自旋极化的费米面约束电子形成奇宇称的自旋三重态库珀对。有趣的是,我们得到的所有奇宇称超导基态都具有非平凡的能带拓扑,表现为手征拓扑超导体、二阶拓扑超导体和节超导体。我们提出,层状双钙钛矿与共线反铁磁性,夹在传统的超导体,是有前途的候选系统,我们的理论思想可以应用。

英文摘要:

We propose a route to achieve odd-parity spin-triplet superconductivity in metallic collinear antiferromagnets with inversion symmetry. Owing to the existence of hidden antiunitary symmetry, which we call the effective time-reversal symmetry (eTRS), the Fermi surfaces of ordinary antiferromagnetic metals are generally spin-degenerate, and spin-singlet pairing is favored. However, by introducing a local inversion symmetry breaking perturbation that also breaks the eTRS, we can lift the degeneracy to obtain spin-polarized Fermi surfaces. In the weak-coupling limit, the spin-polarized Fermi surfaces constrain the electrons to form spin-triplet Cooper pairs with odd-parity. Interestingly, all the odd-parity superconducting ground states we obtained host nontrivial band topologies manifested as chiral topological superconductors, second-order topological superconductors, and nodal superconductors. We propose that layered double-perovskites with collinear antiferromagnetism, sandwiched by conventional superconductors, are promising candidate systems where our theoretical ideas can be applied to.

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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