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

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  • Jeroen Danon
  • Anna Birk Hellenes
  • Esben Bork Hansen
  • Lucas Casparis
  • Andrew P. Higginbotham
  • Flensberg, Karsten

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.

Original languageEnglish
Article number036801
JournalPhysical Review Letters
Issue number3
Number of pages6
Publication statusPublished - 22 Jan 2020

ID: 241833272