Supercurrent in the Presence of Direct Transmission and a Resonant Localized State
Vukan Levajac (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Hristo S. Barakov (TU Delft - QN/Nazarov Group, Kavli institute of nanoscience Delft)
G. P. Mazur (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group, Kavli institute of nanoscience Delft)
Nick Van Loo (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
L. P. Kouwenhoven (Kavli institute of nanoscience Delft, TU Delft - QN/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Yuli V. Nazarov (Kavli institute of nanoscience Delft, TU Delft - QN/Nazarov Group)
Ji Yin Wang (Beijing Academy of Quantum Information Sciences, Beijing, Kavli institute of nanoscience Delft)
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Abstract
We study the current-phase relation (CPR) of an InSb-Al nanowire Josephson junction in parallel magnetic fields up to 700 mT. At high magnetic fields and in narrow voltage intervals of a gate under the junction, the CPR exhibits π shifts. The supercurrent declines within these gate intervals and shows asymmetric gate voltage dependence above and below them. We detect these features sometimes also at zero magnetic field. The observed CPR properties are reproduced by a theoretical model of supercurrent transport via interference between direct transmission and a resonant localized state.