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Yu–Shiba–Rusinov screening of spins in double quantum dots

Author

Listed:
  • K. Grove-Rasmussen

    (University of Copenhagen)

  • G. Steffensen

    (University of Copenhagen)

  • A. Jellinggaard

    (University of Copenhagen)

  • M. H. Madsen

    (University of Copenhagen)

  • R. Žitko

    (University of Ljubljana
    Jozef Stefan Institute)

  • J. Paaske

    (University of Copenhagen)

  • J. Nygård

    (University of Copenhagen)

Abstract

A magnetic impurity coupled to a superconductor gives rise to a Yu–Shiba–Rusinov (YSR) state inside the superconducting energy gap. With increasing exchange coupling the excitation energy of this state eventually crosses zero and the system switches to a YSR ground state with bound quasiparticles screening the impurity spin by ħ/2. Here we explore indium arsenide (InAs) nanowire double quantum dots tunnel coupled to a superconductor and demonstrate YSR screening of spin-1/2 and spin-1 states. Gating the double dot through nine different charge states, we show that the honeycomb pattern of zero-bias conductance peaks, archetypal of double dots coupled to normal leads, is replaced by lines of zero-energy YSR states. These enclose regions of YSR-screened dot spins displaying distinctive spectral features, and their characteristic shape and topology change markedly with tunnel coupling strengths. We find excellent agreement with a simple zero-bandwidth approximation, and with numerical renormalization group calculations for the two-orbital Anderson model.

Suggested Citation

  • K. Grove-Rasmussen & G. Steffensen & A. Jellinggaard & M. H. Madsen & R. Žitko & J. Paaske & J. Nygård, 2018. "Yu–Shiba–Rusinov screening of spins in double quantum dots," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04683-x
    DOI: 10.1038/s41467-018-04683-x
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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. Bhupendra Kumar & Sachin Verma & Tanuj Chamoli & Ajay, 2023. "Josephson transport across T-shaped and series-configured double quantum dots system at infinite- $$\textit{U}$$ U limit," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 96(12), pages 1-13, December.

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