Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
Phys Rev Lett. 2012 Dec 28;109(26):267002. 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.
一种最简单的马约拉纳束缚态实验探针是零偏压隧穿电导的量子化 (2e(2)/h) 值。当温度略高于马约拉纳峰的固有宽度时，电导不再量子化，但零偏压峰仍可能存在。最近在具有近邻诱导超导性的半导体纳米线中报道了这种非量子化的零偏压峰。在这封信件中，我们通过模拟具有实际无序量的多能带线的隧穿电导，分析了零偏压峰与马约拉纳端态存在的关系。我们表明，即使在拓扑平凡且没有马约拉纳端态的情况下，该系统通常也会表现出（非量子化的）零偏压峰。我们进行了与最近实验的比较，并讨论了确认马约拉纳态存在的必要条件。
