Helical spin texture of surface states in topological superconductors
Helical spin texture of surface states in topological superconductors
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DOI：
10.1088/1367-2630/17/1/013016
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发表时间：
2014-05
影响因子：
3.3
通讯作者：
P. Brydon;A. Schnyder;C. Timm
中科院分区：
文献类型：
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作者：
P. Brydon;A. Schnyder;C. Timm
拓扑非中心对称超导体（NCS）的表面态具有复杂的螺旋自旋织构，即，表面准粒子的自旋取向与它们的动量耦合。利用准经典理论，我们研究了表面态的自旋极化随自旋轨道相互作用和超导配对对称性的变化。我们专注于二维和三维完全间隙和节点NCS。对于结点系统，我们证明了拓扑平带的自旋极化是由束缚能隙结点处体正常态的自旋极化控制的。我们证明了磁隧道结中的零偏压电导可以作为表面态自旋极化的实验测试。
Surface states of topological noncentrosymmetric superconductors (NCSs) exhibit intricate helical spin textures, i.e., the spin orientation of the surface quasiparticles is coupled to their momentum. Using quasiclassical theory, we study the spin polarization of the surface states as a function of the spin–orbit interaction and superconducting pairing symmetry. We focus on two- and three-dimensional fully gapped and nodal NCSs. For the case of nodal systems, we show that the spin polarization of the topological flat bands is controlled by the spin polarization of the bulk normal states at the bounding gap nodes. We demonstrate that the zero-bias conductance in a magnetic tunnel junction can be used as an experimental test of the surface-state spin polarization.