Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
J. Ridderbos (University of Twente)
M. Brauns (University of Twente)
Ang Li (Eindhoven University of Technology)
E.P.A.M. M Bakkers (TU Delft - QN/Bakkers Lab, TU Delft - QuTech Advanced Research Centre, Eindhoven University of Technology)
Alexander Brinkman (University of Twente)
Wilfred G. Van Der Wiel (University of Twente)
Floris A. Zwanenburg (University of Twente)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We present a Josephson junction based on a Ge-Si core-shell nanowire with transparent superconducting Al contacts, a building block which could be of considerable interest for investigating Majorana bound states, superconducting qubits, and Andreev (spin) qubits. We demonstrate the dc Josephson effect in the form of a finite supercurrent through the junction and establish the ac Josephson effect by showing up to 23 Shapiro steps. We observe multiple Andreev reflections up to the sixth order, indicating that charges can scatter elastically many times inside our junction and that our interfaces between superconductor and semiconductor are transparent and have low disorder.
help_outline