Helical Liquids and Majorana Bound States in Quantum Wires
Helical Liquids and Majorana Bound States in Quantum Wires
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DOI：
10.1103/physrevlett.105.177002
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发表时间：
2010-10-20
影响因子：
8.6
通讯作者：
von Oppen, Felix
中科院分区：
文献类型：
--
作者：
Oreg, Yuval;Refael, Gil;von Oppen, Felix
我们证明了自旋轨道耦合与塞曼场或强相互作用的结合可能导致单通道量子线中螺旋电子液体的形成，自旋和速度完美相关。我们认为，当这种导线靠近传统的s波超导体时，在各种情况下形成零能量马约拉纳束缚态。当外部磁场，超导间隙，或者最简单地说，化学势沿着导线变化时，就会发生这种情况。这些马约拉纳州不需要在系统中存在漩涡。讨论了螺旋液体和马约拉纳态的实验结果。
We show that the combination of spin-orbit coupling with a Zeeman field or strong interactions may lead to the formation of a helical electron liquid in single-channel quantum wires, with spin and velocity perfectly correlated. We argue that zero-energy Majorana bound states are formed in various situations when such wires are situated in proximity to a conventional s-wave superconductor. This occurs when the external magnetic field, the superconducting gap, or, most simply, the chemical potential vary along the wire. These Majorana states do not require the presence of a vortex in the system. Experimental consequences of the helical liquid and the Majorana states are also discussed.