Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires
Jouri D.S. Bommer (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Hao Zhang (Student TU Delft, Tsinghua University, Kavli institute of nanoscience Delft)
Önder Gül (TU Delft - QRD/Kouwenhoven Lab, TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft)
Bas Nijholt (TU Delft - QN/Akhmerov Group, Kavli institute of nanoscience Delft)
Michael Wimmer (Kavli institute of nanoscience Delft, TU Delft - QRD/Wimmer Group, TU Delft - QuTech Advanced Research Centre)
Filipp N. Rybakov (KTH Royal Institute of Technology)
Julien Garaud (Université Tours)
Diana Car (Eindhoven University of Technology)
Sébastien R. Plissard (Eindhoven University of Technology)
Erik P.A.M. Bakkers (Eindhoven University of Technology, Kavli institute of nanoscience Delft, TU Delft - QN/Bakkers Lab, TU Delft - QuTech Advanced Research Centre)
Leo P. Kouwenhoven (TU Delft - QN/Kouwenhoven Lab, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, Microsoft Quantum Lab Delft)
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Abstract
Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes in semiconductor nanowires proximity coupled to a superconductor. We track the evolution of the induced superconducting gap in InSb nanowires coupled to a NbTiN superconductor in a large range of magnetic field strengths and orientations. Based on realistic simulations of our devices, we reveal SOI with a strength of 0.15-0.35 eV Å. Our approach identifies the direction of the spin-orbit field, which is strongly affected by the superconductor geometry and electrostatic gates.