TY - JOUR
T1 - Multiple Andreev reflections and Shapiro steps in a Ge-Si nanowire Josephson junction
AU - Ridderbos, Joost
AU - Brauns, Matthias
AU - Li, Ang
AU - Bakkers, Erik P.A.M.
AU - Brinkman, Alexander
AU - Van Der Wiel, Wilfred G.
AU - Zwanenburg, Floris A.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072513649&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.3.084803
DO - 10.1103/PhysRevMaterials.3.084803
M3 - Article
AN - SCOPUS:85072513649
SN - 2475-9953
VL - 3
JO - Physical Review Materials
JF - Physical Review Materials
IS - 8
M1 - 084803
ER -