Print Email Facebook Twitter Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands Title Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands Author Shen, J. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) Heedt, S. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) Borsoi, F. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) van Heck, B. (TU Delft QRD/Kouwenhoven Lab; University of California; Microsoft Quantum Lab Delft) Gazibegovic, S. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft; Eindhoven University of Technology) op het Veld, R.L.M. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft; Eindhoven University of Technology) Car, D. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft; Eindhoven University of Technology) Ramakers, S.J.J. (TU Delft Applied Sciences; Kavli institute of nanoscience Delft) Wang, Guanzhong (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) Xu, D. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) Bouman, D. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft) Geresdi, A. (TU Delft QRD/Geresdi Lab; Kavli institute of nanoscience Delft) Bakkers, E.P.A.M. (TU Delft QN/Bakkers Lab; Kavli institute of nanoscience Delft; Eindhoven University of Technology) Kouwenhoven, Leo P. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft; Microsoft Quantum Lab Delft) Faculty Applied Sciences Date 2018 Abstract The number of electrons in small metallic or semiconducting islands is quantised. When tunnelling is enabled via opaque barriers this number can change by an integer. In superconductors the addition is in units of two electron charges (2e), reflecting that the Cooper pair condensate must have an even parity. This ground state (GS) is foundational for all superconducting qubit devices. Here, we study a hybrid superconducting-semiconducting island and find three typical GS evolutions in a parallel magnetic field: a robust 2e-periodic even-parity GS, a transition to a 2e-periodic odd-parity GS, and a transition from a 2e- to a 1e-periodic GS. The 2e-periodic odd-parity GS persistent in gate-voltage occurs when a spin-resolved subgap state crosses zero energy. For our 1e-periodic GSs we explicitly show the origin being a single zero-energy state gapped from the continuum, i.e., compatible with an Andreev bound states stabilized at zero energy or the presence of Majorana zero modes. To reference this document use: http://resolver.tudelft.nl/uuid:1058f0be-3bea-48e8-9317-069bf943f83d DOI https://doi.org/10.1038/s41467-018-07279-7 ISSN 2041-1723 Source Nature Communications, 9 (1) Part of collection Institutional Repository Document type journal article Rights © 2018 J. Shen, S. Heedt, F. Borsoi, B. van Heck, S. Gazibegovic, R.L.M. op het Veld, D. Car, S.J.J. Ramakers, Guanzhong Wang, D. Xu, D. Bouman, A. Geresdi, E.P.A.M. Bakkers, Leo P. Kouwenhoven Files PDF s41467_018_07279_7.pdf 2.93 MB Close viewer /islandora/object/uuid:1058f0be-3bea-48e8-9317-069bf943f83d/datastream/OBJ/view