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Paper detail

Direct Transport between Superconducting Subgap States in a Double Quantum Dot

We demonstrate direct transport between two opposing sets of Yu-Shiba-Rusinov (YSR) subgap states realized in a double quantum dot. This sub-gap transport relies on intrinsic quasiparticle relaxation, but the tunability of the 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 with quasiparticle relaxation, due to a weak tunnel coupling to a nearby normal metal, and obtain excellent agreement with the data.

preprint2021arXivOpen access
Gorm Ole SteffensenJuan Carlos Estrada SaldañaAlexandros VekrisPeter KrogstrupKasper Grove-RasmussenJesper NygårdAlfredo Levy YeyatiJens Paaske
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Gorm Ole SteffensenJuan Carlos Estrada SaldañaAlexandros VekrisPeter KrogstrupKasper Grove-RasmussenJesper NygårdAlfredo Levy YeyatiJens Paaske

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