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Excitations in a superconducting Coulombic energy gap

Author

Listed:
  • Juan Carlos Estrada Saldaña

    (University of Copenhagen)

  • Alexandros Vekris

    (University of Copenhagen
    University of Chinese Academy of Sciences)

  • Luka Pavešić

    (Jožef Stefan Institute
    University of Ljubljana)

  • Peter Krogstrup

    (University of Copenhagen)

  • Rok Žitko

    (Jožef Stefan Institute
    University of Ljubljana)

  • Kasper Grove-Rasmussen

    (University of Copenhagen)

  • Jesper Nygård

    (University of Copenhagen)

Abstract

Cooper pairing and Coulomb repulsion are antagonists, producing distinct energy gaps in superconductors and Mott insulators. When a superconductor exchanges unpaired electrons with a quantum dot, its gap is populated by a pair of electron–hole symmetric Yu-Shiba-Rusinov excitations between doublet and singlet many-body states. The fate of these excitations in the presence of a strong Coulomb repulsion in the superconductor is unknown, but of importance in applications such as topological superconducting qubits and multi-channel impurity models. Here we couple a quantum dot to a superconducting island with a tunable Coulomb repulsion. We show that a strong Coulomb repulsion changes the singlet many-body state into a two-body state. It also breaks the electron–hole energy symmetry of the excitations, which thereby lose their Yu-Shiba-Rusinov character.

Suggested Citation

  • Juan Carlos Estrada Saldaña & Alexandros Vekris & Luka Pavešić & Peter Krogstrup & Rok Žitko & Kasper Grove-Rasmussen & Jesper Nygård, 2022. "Excitations in a superconducting Coulombic energy gap," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29634-5
    DOI: 10.1038/s41467-022-29634-5
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    References listed on IDEAS

    as
    1. R. M. Potok & I. G. Rau & Hadas Shtrikman & Yuval Oreg & D. Goldhaber-Gordon, 2007. "Observation of the two-channel Kondo effect," Nature, Nature, vol. 446(7132), pages 167-171, March.
    2. Sergio Vlaic & Stéphane Pons & Tianzhen Zhang & Alexandre Assouline & Alexandre Zimmers & Christophe David & Guillemin Rodary & Jean-Christophe Girard & Dimitri Roditchev & Hervé Aubin, 2017. "Superconducting parity effect across the Anderson limit," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    3. S. M. Albrecht & A. P. Higginbotham & M. Madsen & F. Kuemmeth & T. S. Jespersen & J. Nygård & P. Krogstrup & C. M. Marcus, 2016. "Exponential protection of zero modes in Majorana islands," Nature, Nature, vol. 531(7593), pages 206-209, March.
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