Mi Shuo, Burset Pablo, Flindt Christian
Department of Applied Physics, Aalto University, 00076, Aalto, Finland.
Univ. Grenoble Alpes, CEA, INAC-Pheliqs, 38000, Grenoble, France.
Sci Rep. 2018 Nov 15;8(1):16828. doi: 10.1038/s41598-018-34776-y.
We investigate the waiting time distributions (WTDs) of superconducting hybrid junctions, considering both conventional and topologically nontrivial superconductors hosting Majorana bound states at their edges. To this end, we employ a scattering matrix formalism that allows us to evaluate the waiting times between the transmissions and reflections of electrons or holes. Specifically, we analyze normal-metal-superconductor (NIS) junctions and NISIN junctions, where Cooper pairs are spatially split into different leads. The distribution of waiting times is sensitive to the simultaneous reflection of electrons and holes, which is enhanced by the zero-energy state in topological superconductors. For the NISIN junctions, the WTDs of trivial superconductors feature a sharp dependence on the applied voltage, while for topological ones they are mostly independent of it. This particular voltage dependence is again connected to the presence of topological edge states, showing that WTDs are a promising tool for identifying topological superconductivity.
我们研究了超导混合结的等待时间分布（WTDs），同时考虑了在其边缘承载马约拉纳束缚态的传统超导体和拓扑非平凡超导体。为此，我们采用了一种散射矩阵形式，它使我们能够评估电子或空穴传输和反射之间的等待时间。具体来说，我们分析了正常金属 - 超导体（NIS）结和NISIN结，其中库珀对在空间上被分成不同的引线。等待时间的分布对电子和空穴的同时反射很敏感，这在拓扑超导体中由于零能态而增强。对于NISIN结，平凡超导体的WTDs对施加电压有强烈的依赖性，而对于拓扑超导体，它们大多与之无关。这种特殊的电压依赖性再次与拓扑边缘态的存在相关联，表明WTDs是识别拓扑超导性的一个有前途的工具。
