Supercurrent in a Double Quantum Dot

被引：45

作者：

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

Vekris, A. ^{[1
]}

Steffensen, G. ^{[1
]}

Zitko, R. ^{[2
,3
]}

Krogstrup, P. ^{[1
,4
]}

Paaske, J. ^{[1
]}

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

Nygard, J. ^{[1
]}

机构：

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

[2] Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia

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

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

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 25期

基金：

欧洲研究理事会; 欧盟地平线“2020”; 新加坡国家研究基金会;

关键词：

NUMERICAL RENORMALIZATION-GROUP; JOSEPHSON CURRENT; MAGNETIC-IMPURITIES; ANDERSON MODEL; STATES; TRANSPORT;

D O I：

10.1103/PhysRevLett.121.257701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The supercurrent stability diagram adopts a honeycomb pattern. We observe sharp discontinuities in the magnitude of the critical current, I-c, as a function of dot occupation, related to doublet to singlet ground state transitions. Detuning of the energy levels offers a tuning knob for I-c, which attains a maximum at zero detuning. The consistency between experiment and theory indicates that our device is a faithful realization of the two-impurity Anderson model.

引用

页数：6

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