Excitations in a superconducting Coulombic energy gap

Juan Carlos Estrada Saldaña (), Alexandros Vekris, Luka Pavešić, Peter Krogstrup, Rok Žitko, Kasper Grove-Rasmussen and Jesper Nygård ()
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Juan Carlos Estrada Saldaña: University of Copenhagen
Alexandros Vekris: University of Copenhagen
Luka Pavešić: Jožef Stefan Institute
Peter Krogstrup: University of Copenhagen
Rok Žitko: Jožef Stefan Institute
Kasper Grove-Rasmussen: University of Copenhagen
Jesper Nygård: University of Copenhagen

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-29634-5

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