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Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires

Author

Listed:
  • Guanzhong Wang

    (Delft University of Technology)

  • Tom Dvir

    (Delft University of Technology)

  • Grzegorz P. Mazur

    (Delft University of Technology)

  • Chun-Xiao Liu

    (Delft University of Technology)

  • Nick van Loo

    (Delft University of Technology)

  • Sebastiaan L. D. ten Haaf

    (Delft University of Technology)

  • Alberto Bordin

    (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)

  • Michael Wimmer

    (Delft University of Technology)

  • Leo P. Kouwenhoven

    (Delft University of Technology)

Abstract

In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not been conclusively identified, nor synthesized, despite promising progress1–3. Instead, engineered platforms where s-wave superconductors are brought into contact with magnetic materials have shown convincing signatures of equal-spin pairing4–6. Here we directly measure equal-spin pairing between spin-polarized quantum dots. This pairing is proximity-induced from an s-wave superconductor into a semiconducting nanowire with strong spin–orbit interaction. We demonstrate such pairing by showing that breaking a Cooper pair can result in two electrons with equal spin polarization. Our results demonstrate controllable detection of singlet and triplet pairing between the quantum dots. Achieving such triplet pairing in a sequence of quantum dots will be required for realizing an artificial Kitaev chain7–9.

Suggested Citation

  • 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.
  • Handle: RePEc:nat:nature:v:612:y:2022:i:7940:d:10.1038_s41586-022-05352-2
    DOI: 10.1038/s41586-022-05352-2
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    Cited by:

    1. Juan Carlos Estrada Saldaña & Alexandros Vekris & Luka Pavešič & Rok Žitko & Kasper Grove-Rasmussen & Jesper Nygård, 2024. "Correlation between two distant quasiparticles in separate superconducting islands mediated by a single spin," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    2. Francesco Zatelli & David van Driel & Di Xu & Guanzhong Wang & Chun-Xiao Liu & Alberto Bordin & Bart Roovers & Grzegorz P. Mazur & Nick van Loo & Jan C. Wolff & A. Mert Bozkurt & Ghada Badawy & Sasa G, 2024. "Robust poor man’s Majorana zero modes using Yu-Shiba-Rusinov states," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Qingzhen Wang & Sebastiaan L. D. Haaf & Ivan Kulesh & Di Xiao & Candice Thomas & Michael J. Manfra & Srijit Goswami, 2023. "Triplet correlations in Cooper pair splitters realized in a two-dimensional electron gas," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    4. Marco Valentini & Oliver Sagi & Levon Baghumyan & Thijs Gijsel & Jason Jung & Stefano Calcaterra & Andrea Ballabio & Juan Aguilera Servin & Kushagra Aggarwal & Marian Janik & Thomas Adletzberger & Rub, 2024. "Parity-conserving Cooper-pair transport and ideal superconducting diode in planar germanium," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    5. 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.

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