Nonlocal conductance spectroscopy of Andreev bound states in gate-defined InAs/Al nanowires (2204.02430v1)

Published 5 Apr 2022 in cond-mat.mes-hall and cond-mat.supr-con

Abstract: The charge character of Andreev bound states (ABSs) in a three-terminal semiconductor-superconductor hybrid nanowire was measured using local and nonlocal tunneling spectroscopy. The device is fabricated using an epitaxial InAs/Al two-dimensional heterostructure with several gate-defined side probes. ABSs are found to oscillate around zero as a function of gate voltage, with modifications of their charge consistent with theoretical expectations for the total Bardeen-Cooper- Schrieffer (BCS) charge of ABSs.