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Parity transitions in the superconducting ground state of hybrid InSb-Al Coulomb islands

Journal Article (2018)
Authors

Jie Shen (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Sebastian Heedt (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Francesco Borsoi (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Bernard van Heck (Microsoft Quantum Lab Delft, TU Delft - QRD/Kouwenhoven Lab, University of California)

S. Gazibegovic (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab, Eindhoven University of Technology)

Roy L.M. Op het Veld (Eindhoven University of Technology, TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Diana Car (TU Delft - QRD/Kouwenhoven Lab, Eindhoven University of Technology, Kavli institute of nanoscience Delft)

S.J.J. Ramakers (Kavli institute of nanoscience Delft, TU Delft - Applied Sciences)

Guanzhong Wang (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Di Xu (Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

D. Bouman (TU Delft - QRD/Kouwenhoven Lab, Kavli institute of nanoscience Delft)

Attila Geresdi (TU Delft - QRD/Geresdi Lab, Kavli institute of nanoscience Delft)

EPAM Bakkers (Eindhoven University of Technology, QN/Bakkers Lab, Kavli institute of nanoscience Delft)

Leo Kouwenhoven (Microsoft Quantum Lab Delft, Kavli institute of nanoscience Delft, TU Delft - QRD/Kouwenhoven Lab)

Research Group
QRD/Kouwenhoven Lab
Copyright
© 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
To reference this document use:
https://doi.org/10.1038/s41467-018-07279-7
More Info
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Publication Year
2018
Language
English
Copyright
© 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
Research Group
QRD/Kouwenhoven Lab
Issue number
1
Volume number
9
DOI:
https://doi.org/10.1038/s41467-018-07279-7
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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.