Nonlocal Conductance Spectroscopy of Andreev Bound States: Symmetry Relations and BCS Charges

被引：70

作者：

Danon, Jeroen ^{[1
]}

Hellenes, Anna Birk ^{[2
]}

Hansen, Esben Bork ^{[2
]}

Casparis, Lucas ^{[2
,3
]}

Higginbotham, Andrew P. ^{[2
,3
]}

Flensberg, Karsten ^{[2
]}

机构：

[1] Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, NO-7491 Trondheim, Norway

[2] Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark

[3] Univ Copenhagen, Niels Bohr Inst, Microsoft Quantum Copenhagen, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

MAJORANA; SUPERCONDUCTOR; DOT;

D O I：

10.1103/PhysRevLett.124.036801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：6

共 46 条

[1] Quantized Conductance at the Majorana Phase Transition in a Disordered Superconducting Wire [J].