Year: 2022
Type: article
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.
Authors: G. O. Steffensen, J. C. Estrada Saldaña, A. Vekris, P. Krogstrup, K. Grove-Rasmussen, J. Nygård, A. L. Yeyati, J. Paaske
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G1626890794, G1671306541, G3181133312, G4020117823, G4081538058, G434337789, G4590236199, Topologically protected states in double nanowire superconductor hybrids, G4796948450, Screening of an electron spin by an epitaxial superconducting island in a semiconductor nanowire, G5578903600, G6141010720, G6250393416, G8027161673, Hybrid Epitaxial Materials for Novel Quantum State Detection and Manipulation, Andreev qubits for scalable quantum computation
OpenAlex ID: W3161979283