Conduction Channels of an InAs-Al nanowire Josephson weak link

Abstract

We present a quantitative characterization of an electrically tunable Josephson junction defined in an InAs nanowire proximitized by an epitax-ially-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.

Added reference in New Journal of Physics, corrected a few typos, and updated references

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• Majorana bound states in a coupled quantum-dot hybrid-nanowire system
• Epitaxy of Semiconductor-Superconductor nanowires
• Hard gap in epitaxial semiconductor-superconductor nanowires
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