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磁场对超导量子点平凡和拓扑束缚态的影响

Magnetic field effect on trivial and topological bound states of superconducting quantum dot.

作者信息

Górski G, Kucab K, Domański T

机构信息

Institute of Physics, College of Natural Sciences, University of Rzeszów, ul. Pigonia 1, PL-35-310 Rzeszów, Poland.

Institute of Physics, M. Curie-Skłodowska University, ul. Radziszewskiego 10, PL-20-031 Lublin, Poland.

出版信息

J Phys Condens Matter. 2020 Aug 7;32(44). doi: 10.1088/1361-648X/aba38a.

Abstract

We investigate the properties of a quantum dot embedded between the normal and superconducting leads which is additionally side-attached to the topological superconducting nanowire, hosting the Majorana modes. This setup enables formation of the trivial (finite-energy) bound states induced in the quantum dot through the superconducting proximity effect, coexisting/competing with the topological (zero-energy) mode transmitted from the topological superconductor. We analyze their interplay, focusing on a role played by the external magnetic field. To distinguish between these bound states we analyze the qualitative and quantitative features manifested in the subgap charge tunneling originating under nonequilibrium conditions from the Andreev (particle to hole) scattering processes.

摘要

我们研究了嵌入在正常和超导引线之间的量子点的性质,该量子点还侧面连接到承载马约拉纳模式的拓扑超导纳米线。这种设置能够通过超导邻近效应在量子点中形成平凡(有限能量)束缚态,这些束缚态与从拓扑超导体传输过来的拓扑(零能量)模式共存/竞争。我们分析它们之间的相互作用,重点关注外部磁场所起的作用。为了区分这些束缚态,我们分析了在非平衡条件下由安德列夫(粒子到空穴)散射过程产生的亚能隙电荷隧穿中表现出的定性和定量特征。

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