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Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices

Author

Listed:
  • David Driel

    (Delft University of Technology)

  • Guanzhong Wang

    (Delft University of Technology)

  • Alberto Bordin

    (Delft University of Technology)

  • Nick Loo

    (Delft University of Technology)

  • Francesco Zatelli

    (Delft University of Technology)

  • Grzegorz P. Mazur

    (Delft University of Technology)

  • Di Xu

    (Delft University of Technology)

  • Sasa Gazibegovic

    (Eindhoven University of Technology)

  • Ghada Badawy

    (Eindhoven University of Technology)

  • Erik P. A. M. Bakkers

    (Eindhoven University of Technology)

  • Leo P. Kouwenhoven

    (Delft University of Technology)

  • Tom Dvir

    (Delft University of Technology)

Abstract

Semiconductor nanowires coupled to superconductors can host Andreev bound states with distinct spin and parity, including a spin-zero state with an even number of electrons and a spin-1/2 state with odd-parity. Considering the difference in spin of the even and odd states, spin-filtered measurements can reveal the underlying ground state. To directly measure the spin of single-electron excitations, we probe an Andreev bound state using a spin-polarized quantum dot that acts as a bipolar spin filter, in combination with a non-polarized tunnel junction in a three-terminal circuit. We observe a spin-polarized excitation spectrum of the Andreev bound state, which can be fully spin-polarized, despite strong spin-orbit interaction in the InSb nanowires. Decoupling the hybrid from the normal lead causes a current blockade, by trapping the Andreev bound state in an excited state. Spin-polarized spectroscopy of hybrid nanowire devices, as demonstrated here, is proposed as an experimental tool to support the observation of topological superconductivity.

Suggested Citation

  • David Driel & Guanzhong Wang & Alberto Bordin & Nick Loo & Francesco Zatelli & Grzegorz P. Mazur & Di Xu & Sasa Gazibegovic & Ghada Badawy & Erik P. A. M. Bakkers & Leo P. Kouwenhoven & Tom Dvir, 2023. "Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42026-7
    DOI: 10.1038/s41467-023-42026-7
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    as
    1. Tom Dvir & Guanzhong Wang & Nick Loo & Chun-Xiao Liu & Grzegorz P. Mazur & Alberto Bordin & Sebastiaan L. D. Haaf & Ji-Yin Wang & David Driel & Francesco Zatelli & Xiang Li & Filip K. Malinowski & Sas, 2023. "Realization of a minimal Kitaev chain in coupled quantum dots," Nature, Nature, vol. 614(7948), pages 445-450, February.
    2. Sebastian Heedt & Marina Quintero-Pérez & Francesco Borsoi & Alexandra Fursina & Nick Loo & Grzegorz P. Mazur & Michał P. Nowak & Mark Ammerlaan & Kongyi Li & Svetlana Korneychuk & Jie Shen & May An Y, 2021. "Shadow-wall lithography of ballistic superconductor–semiconductor quantum devices," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    3. Guanzhong Wang & Tom Dvir & Grzegorz P. Mazur & Chun-Xiao Liu & Nick van Loo & Sebastiaan L. D. ten Haaf & Alberto Bordin & Sasa Gazibegovic & Ghada Badawy & Erik P. A. M. Bakkers & Michael Wimmer & L, 2022. "Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires," Nature, Nature, vol. 612(7940), pages 448-453, December.
    4. Nick Loo & Grzegorz P. Mazur & Tom Dvir & Guanzhong Wang & Robin C. Dekker & Ji-Yin Wang & Mathilde Lemang & Cristina Sfiligoj & Alberto Bordin & David Driel & Ghada Badawy & Sasa Gazibegovic & Erik P, 2023. "Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
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