Nonlocal Conductance Spectroscopy of Andreev Bound States: Symmetry Relations and BCS Charges.,Physical Review Letters

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Nonlocal Conductance Spectroscopy of Andreev Bound States: Symmetry Relations and BCS Charges.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.036801
Jeroen Danon ₁ , Anna Birk Hellenes ₂ , Esben Bork Hansen ₂ , Lucas Casparis _{2,

3} , Andrew P Higginbotham _{2,

3} , Karsten Flensberg ₂

Affiliation

Two-terminal conductance spectroscopy of superconducting devices is a common tool for probing Andreev and Majorana bound states. Here, we study theoretically a three-terminal setup, with two normal leads coupled to a grounded superconducting terminal. Using a single-electron scattering matrix, we derive the subgap conductance matrix for the normal leads and discuss its symmetries. In particular, we show that the local and the nonlocal elements of the conductance matrix have pairwise identical antisymmetric components. Moreover, we find that the nonlocal elements are directly related to the local BCS charges of the bound states close to the normal probes and we show how the BCS charge of overlapping Majorana bound states can be extracted from experiments.

中文翻译：

Andreev束缚态的非局部电导光谱：对称关系和BCS电荷。

超导设备的两端电导光谱学是探测Andreev和Majorana束缚态的常用工具。在这里，我们从理论上研究一个三端子设置，其中两个法线连接到接地的超导端子。使用单电子散射矩阵，我们导出了正常引线的亚间隙电导矩阵，并讨论了其对称性。特别地，我们显示出电导矩阵的局部和非局部元素具有成对相同的反对称分量。此外，我们发现非局部元素与接近于正常探针的结合态的局部BCS电荷直接相关，并且我们展示了如何从实验中提取重叠马约拉邦结合态的BCS电荷。

更新日期：2020-01-23

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