Abstract
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.
- Received 2 May 2019
- Corrected 28 January 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.036801
© 2020 American Physical Society
Physics Subject Headings (PhySH)
Corrections
28 January 2020
Correction: The article identification number for this Letter was assigned incorrectly and has been fixed.