论文标题
中心对称性抗铁磁金属中的奇数自旋三键超导性
Odd-Parity Spin-Triplet Superconductivity in Centrosymmetric Antiferromagnetic Metals
论文作者
论文摘要
我们提出了一条途径，以实现具有反转对称性的金属线性抗铁磁体中的奇数自旋三个超导性。由于存在隐藏的反对称对称性，我们称之为有效的时间反转对称性（ETRS），普通抗磁力金属的费米表面通常是自旋脱位的，并且旋转单琴配对受到青睐。但是，通过引入局部反转对称性破坏扰动，也破坏了ETR，我们可以提起退化以获得自旋极化的费米表面。在弱耦合极限中，自旋偏振的费米表面限制了电子形成旋转的库珀对具有奇数。有趣的是，我们获得的所有奇数超导态基态都表现为手性拓扑超导体，二阶拓扑超导体和节点超导体。我们建议用常规超导体夹杂的层次抗铁磁性分层的双植物，这是有希望的候选系统，可以将我们的理论思想应用于。
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.
