Spin-orbital hallmarks of unconventional superconductors without inversion symmetry
Spin-orbital hallmarks of unconventional superconductors without inversion symmetry
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DOI：
10.1103/physrevb.100.104524
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发表时间：
2019-03
影响因子：
3.7
通讯作者：
Yuri Fukaya;S. Tamura;K. Yada;Yukio Tanaka;P. Gentile;M. Cuoco
中科院分区：
文献类型：
--
作者：
Yuri Fukaya;S. Tamura;K. Yada;Yukio Tanaka;P. Gentile;M. Cuoco
结果表明，动量空间中超导激发的自旋-轨道极化提供了存在反转对称破缺时的非常规配对的明显标志。以具有原子自旋-轨道和轨道-Rashba耦合的电子系统为例，给出了自旋-轨道织构及其最显著的从正常态到超导态的转变的一般描述。我们发现，自旋三重态矢量的不对准和反转不对称矢量耦合以及超导节块激发的出现强烈地印记了自旋织构的变化。值得注意的是，超导态的多轨道特性允许我们揭示一种独特的类型的拓扑转变，即围绕结点的自旋缠绕。这一发现揭示了节点超导体中手征和自旋绕组之间的基本拓扑关系。通过对自旋-轨道-三重态配对的类比，我们指出轨道极化图样也可以用来评估超导态的性质。
The spin-orbital polarization of superconducting excitations in momentum space is shown to provide distinctive marks of unconventional pairing in the presence of inversion symmetry breaking. Taking the prototypical example of an electronic system with atomic spin-orbit and orbital-Rashba couplings, we provide a general description of the spin-orbital textures and their most striking changeover moving from the normal to the superconducting state. We find that the variation of the spin texture is strongly imprinted by the combination of the misalignment of spin-triplet $\mathbf{d}$ vector with the inversion asymmetry $\mathbf{g}$-vector coupling and the occurrence of superconducting nodal excitations. Remarkably, the multiorbital character of the superconducting state allows us to unveil a unique type of topological transition for the spin winding around the nodal points. This finding indicates the fundamental topological relation between chiral and spin winding in nodal superconductors. By analogy between spin- and orbital-triplet pairing we point out how orbital polarization patterns can also be employed to assess the character of the superconducting state.