Spin-Orbit Interaction and Induced Superconductivity in a One-Dimensional Hole Gas
Folkert K. De Vries (TU Delft - QRD/Goswami Lab, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
Jie Shen (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Rafal J. Skolasinski (Kavli institute of nanoscience Delft, TU Delft - Quantum Computing Division, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group)
Michal P. Nowak (AGH University of Science and Technology)
Daniel Varjas (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)
Lin Wang (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QN/Akhmerov Group)
Michael Wimmer (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Wimmer Group)
Floris A. Zwanenburg (University of Twente)
Ang Li (Eindhoven University of Technology)
Sebastian Koelling (Eindhoven University of Technology)
Marcel A. Verheijen (Philips Research, Eindhoven University of Technology)
Erik P.A.M. Bakkers (Eindhoven University of Technology)
Leo P. Kouwenhoven (Microsoft Quantum Lab Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)
undefined More Authors (External organisation)
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
Low dimensional semiconducting structures with strong spin-orbit interaction (SOI) and induced superconductivity attracted great interest in the search for topological superconductors. Both the strong SOI and hard superconducting gap are directly related to the topological protection of the predicted Majorana bound states. Here we explore the one-dimensional hole gas in germanium silicon (Ge-Si) core-shell nanowires (NWs) as a new material candidate for creating a topological superconductor. Fitting multiple Andreev reflection measurements shows that the NW has two transport channels only, underlining its one-dimensionality. Furthermore, we find anisotropy of the Landé g-factor that, combined with band structure calculations, provides us qualitative evidence for the direct Rashba SOI and a strong orbital effect of the magnetic field. Finally, a hard superconducting gap is found in the tunneling regime and the open regime, where we use the Kondo peak as a new tool to gauge the quality of the superconducting gap.
help_outline