Majorana Bound States and Nonlocal Spin Correlations in a Quantum Wire on an Unconventional Superconductor
Majorana Bound States and Nonlocal Spin Correlations in a Quantum Wire on an Unconventional Superconductor
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DOI：
10.1103/physrevlett.110.117002
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发表时间：
2013-03-12
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Nakosai, Sho;Budich, Jan Carl;Nagaosa, Naoto
我们从理论上研究了位于非常规超导体顶部的一维金属量子线（在没有自旋轨道相互作用的情况下）的接近效应。三种不同的材料类别被认为是衬底：(i)具有破时间反转对称性的D类手性超导体和（ii）具有和（iii）不具有非平凡Z(2)数的DIII类超导体。有趣的是，我们发现在这三种情况下导线两端的简并零能量马约拉纳束缚态。在情况(i)下，它们在自旋轨道相互作用下是不稳定的，而在情况（ii）和（iii）下，它们在拓扑上受到时间反转对称性的保护。值得注意的是，我们表明，在我们的设置中，导线两端之间的非局部自旋相关可以简单地由栅极电位控制。DOI: 10.1103 / PhysRevLett.110.117002
We study theoretically the proximity effect of a one-dimensional metallic quantum wire (in the absence of spin-orbit interaction) lying on top of an unconventional superconductor. Three different material classes are considered as a substrate: (i) a chiral superconductor in class D with broken time-reversal symmetry and a class DIII superconductor (ii) with and (iii) without a nontrivial Z(2) number. Interestingly, we find degenerate zero energy Majorana bound states at both ends of the wire for all three cases. They are unstable against spin-orbit interaction in case (i), while they are topologically protected by time-reversal symmetry in cases (ii) and (iii). Remarkably, we show that nonlocal spin correlations between the two ends of the wire can be simply controlled by a gate potential in our setup. DOI: 10.1103/PhysRevLett.110.117002