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  • Letter

Direct transport between superconducting subgap states in a double quantum dot

G. O. Steffensen1, J. C. Estrada Saldaña1, A. Vekris1,2, P. Krogstrup1, K. Grove-Rasmussen1, J. Nygård1, A. L. Yeyati3, and J. Paaske1

  • 1Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
  • 2Sino-Danish Center for Education and Research (SDC) SDC Building, Yanqihu Campus, University of Chinese Academy of Sciences, 380 Huaibeizhuang, Beijing 101408, Huairou, China
  • 3Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC), and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain

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Phys. Rev. B 105, L161302 – Published 15 April, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L161302

Abstract

We demonstrate direct transport between two opposing sets of Yu-Shiba-Rusinov (YSR) subgap states realized in a double quantum dot. This bound-state-to-bound-state transport relies on intrinsic quasiparticle relaxation, and the tunable gating of this quantum dot device allows us to explore also an additional relaxation mechanism based on charge transferring Andreev reflections. The transition between these two relaxation regimes is identified in the experiment as a marked gate-induced stepwise change in conductance. We present a transport calculation, including YSR bound states and multiple Andreev reflections alongside quasiparticle relaxation, due to a weak tunnel coupling to a nearby normal metal, and obtain excellent agreement with the data.

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Phys. Rev. B 105, L161302– Published 15 April, 2022
  • Received 14 May 2021
  • Revised 29 March 2022
  • Accepted 4 April 2022
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