Two-impurity Yu-Shiba-Rusinov states in coupled quantum dots

被引：33

作者：

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

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

Zitko, R. ^{[3
,4
]}

Steffensen, G. ^{[1
]}

Krogstrup, P. ^{[1
,5
]}

Paaske, J. ^{[1
]}

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

Nygard, J. ^{[1
]}

机构：

[1] Univ Copenhagen, Ctr Quantum Devices, Niels Bohr Inst, 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] Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia

[4] Univ Ljubljana, Fac Math & Phys, Jadranska 19, SI-1000 Ljubljana, Slovenia

[5] Univ Copenhagen, Niels Bohr Inst, Microsoft Quantum Mat Lab Copenhagen, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW B | 2020年 / 102卷 / 19期

基金：

新加坡国家研究基金会; 欧盟地平线“2020”; 欧洲研究理事会;

关键词：

Current voltage characteristics - Josephson junction devices - Quantum optics - Nanocrystals - Ground state;

D O I：

10.1103/PhysRevB.102.195143

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using double quantum dots as the weak link of a Josephson junction, we realize the superconducting analog of the celebrated two-impurity Kondo model. The device shows a cusped current-voltage characteristic, which can be modeled by an overdamped circuit relating the observed cusp current to the Josephson critical current. The gate dependence of the cusp current and of the subgap spectra are used as complementary ground-state indicators to demonstrate gate-tuned changes of the ground state from an interdot singlet to independently screened Yu-Shiba-Rusinov (YSR) singlets. In contrast to the two-impurity Kondo effect in normal-state systems, the crossover between these two singlets is heralded by quantum phase boundaries to nearby doublet YSR phases in which only a single spin is screened.

引用

页数：15

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