Zero-Bias Peaks in the Tunneling Conductance of Spin-Orbit-Coupled Superconducting Wires with and without Majorana End-States
Zero-Bias Peaks in the Tunneling Conductance of Spin-Orbit-Coupled Superconducting Wires with and without Majorana End-States
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DOI：
10.1103/physrevlett.109.267002
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发表时间：
2012-12-28
影响因子：
8.6
通讯作者：
Lee, Patrick A.
中科院分区：
文献类型：
--
作者：
Liu, Jie;Potter, Andrew C.;Lee, Patrick A.
对Majorana束缚态最简单的实验探测之一是零偏置隧道电导的量子化(2e(2)/h)值。当温度略大于Majorana峰的固有宽度时，电导不再被量化，但可以保持零偏压峰。这种非量子化的零偏压峰最近被报道用于具有邻近诱导超导电性的半导体纳米线。在这封信中，我们通过模拟具有实际无序量的多带导线的隧穿电导，分析了零偏压峰值与Majorana端态的存在的关系。我们发现，即使导线在拓扑上平凡且不具有Majorana端态，该系统通常也表现出(非量子化的)零偏压峰。我们与最近的实验进行了比较，并讨论了确认Majorana状态存在的必要条件。DOI：10.1103/PhysRevLett.109.267002
One of the simplest proposed experimental probes of a Majorana bound state is a quantized (2e(2)/h) value of zero-bias tunneling conductance. When temperature is somewhat larger than the intrinsic width of the Majorana peak, conductance is no longer quantized, but a zero-bias peak can remain. Such a nonquantized zero-bias peak has been recently reported for semiconducting nanowires with proximity induced superconductivity. In this Letter we analyze the relation of the zero-bias peak to the presence of Majorana end states, by simulating the tunneling conductance for multiband wires with realistic amounts of disorder. We show that this system generically exhibits a (nonquantized) zero-bias peak even when the wire is topologically trivial and does not possess Majorana end states. We make comparisons to recent experiments, and discuss the necessary requirements for confirming the existence of a Majorana state. DOI: 10.1103/PhysRevLett.109.267002