Electric field tunable superconductor-semiconductor coupling in Majorana nanowires
Michiel W.A. De Moor (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Jouri D.S. Bommer (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Di Xu (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Georg W. Winkler (Microsoft Research)
Andrey E. Antipov (Microsoft Research)
Arno Bargerbos (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Guanzhong Wang (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre)
Nick Van Loo (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences, TU Delft - QuTech Advanced Research Centre)
Roy L.M. Op Het Veld (TU Delft - QRD/Kouwenhoven Lab, Eindhoven University of Technology, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
Sasa Gazibegovic (Eindhoven University of Technology, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab)
Diana Car (TU Delft - QRD/Kouwenhoven Lab, Eindhoven University of Technology, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Erik P.A. M Bakkers (Eindhoven University of Technology, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Bakkers Lab, Kavli institute of nanoscience Delft)
Leo P. Kouwenhoven (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Microsoft Quantum Lab Delft, Kavli institute of nanoscience Delft)
Hao Zhang (TU Delft - Applied Sciences, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre)
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Abstract
We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.
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