Direct transport between superconducting subgap states in a double quantum dot

被引：9

作者：

Steffensen, G. O. ^{[1
]}

Saldana, J. C. Estrada ^{[1
]}

Vekris, A. ^{[1
,2
]}

Krogstrup, P. ^{[1
]}

Grove-Rasmussen, K. ^{[1
]}

Nygard, J. ^{[1
]}

Yeyati, A. L. ^{[3
,4
]}

Paaske, J. ^{[1
]}

机构：

[1] Univ Copenhagen, Niels Bohr Inst, Ctr Quantum Devices, DK-2100 Copenhagen, Denmark

[2] Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res SDC, SDC Bldg,Yanqihu Campus,380 Huaibeizhuang, Beijing 101408, Peoples R China

[3] Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, Condensed Matter Phys Ctr IFIMAC, Madrid 28049, Spain

[4] Univ Autonoma Madrid, Inst Nicolas Cabrera, Madrid 28049, Spain

来源：

PHYSICAL REVIEW B | 2022年 / 105卷 / 16期

基金：

欧盟地平线“2020”; 欧洲研究理事会; 新加坡国家研究基金会;

关键词：

COHERENT MANIPULATION;

D O I：

10.1103/PhysRevB.105.L161302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

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