Direct Transport between Superconducting Subgap States in a Double Quantum Dot
arXiv:2105.06815 · doi: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 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.
References in corpus (8)
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- Richardson model with complex level structure and spin-orbit coupling for hybrid superconducting islands: stepwise suppression of pairing and magnetic pinning
- YSR Bond Qubit in a Double Quantum Dot with cQED Operation
- Characterizing local Majorana properties using Andreev states
- Scalable Effective Models for Superconducting Nanostructures: Applications to Double, Triple, and Quadruple Quantum Dots
- DC Josephson effect between two Yu-Shiba-Rusinov bound states
- Quantum phase transition in a double quantum dot Josephson junction driven by electron-electron interactions
- Magnetic flux controlled current phase relationship in double Quantum Dot Josephson junction
- Optimal Majoranas in Mesoscopic Kitaev Chains