High critical-current superconductor-InAs nanowire-superconductor junctions

ORAL

Abstract

We report on InAs nanowires coupled to superconducting leads with high critical current and widely tunable conductance. We implemented a double lift-off nanofabrication method to get very short nanowire devices with Ohmic contacts. We observe very high critical currents of up to 800\,nA in a wire with a diameter of 80\,nm. The current-voltage characteristics of longer and suspended nanowires display either Coulomb blockade or supercurrent depending on a local gate voltage, combining different regimes of transport in a single device. In addition, both the conductance and the critical current of the suspended devices increased step-wise as a function of the local gate voltage.

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Authors

  • Simon Abay

    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 412 96 G\"oteborg, Sweden

  • Henrik Nilsson

    • Division of Solid State Physics, Lund University, 221 00 Lund, Sweden

  • Fan Wu

    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 412 96 G\"oteborg, Sweden

  • C.M. Wilson

    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Sweden
    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 412 96 G\"oteborg, Sweden

  • H.Q. Xu

    • Division of Solid State Physics, Lund University, 221 00 Lund, Sweden

  • Per Delsing

    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, Sweden
    • Department of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, 412 96 G\"oteborg, Sweden