New Journal of Physics (Jan 2017)

Conduction channels of an InAs-Al nanowire Josephson weak link

  • M F Goffman,
  • C Urbina,
  • H Pothier,
  • J Nygård,
  • C M Marcus,
  • P Krogstrup

DOI
https://doi.org/10.1088/1367-2630/aa7641
Journal volume & issue
Vol. 19, no. 9
p. 092002

Abstract

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We present a quantitative characterization of an electrically tunable Josephson junction defined in an InAs nanowire proximitized by an epitaxially-grown superconducting Al shell. The gate-dependence of the number of conduction channels and of the set of transmission coefficients are extracted from the highly nonlinear current–voltage characteristics. Although the transmissions evolve non-monotonically, the number of independent channels can be tuned, and configurations with a single quasi-ballistic channel achieved.

Keywords