首页|Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations

Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations

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The interplay between superconductivity and the Kondo effect has stimulated significant interest in condensed matter physics.They compete when their critical temperatures are close and can give rise to a quantum phase transition that can mimic Majo-rana zero modes.Here,we have fabricated and measured Al-InSb nanowire quantum dot-Al devices.In the Kondo regime,a supercurrent-induced zero-bias conductance peak emerges.This zero-bias peak shows an anomalous negative magnetoresistance(NMR)at weak magnetic fields.We attribute this anomalous NMR to quasiparticle trapping at vortices in the superconductor leads as a weak magnetic field is applied.The trapping effect lowers the quasiparticle-caused dissipation and thus enhances the Josephson current.This work connects the vortex physics and the supercurrent tunneling in Kondo regimes and can help further understand the physics of Josephson quantum dot system.

quantum dotKondo correlationInSb nanowirequasiparticle trapping

Mingtang Deng、Chunlin Yu、Guangyao Huang、Rosa López、Philippe Caroff、Sepideh Ghalamestani、Gloria Platero、Hongqi Xu

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Institute for Quantum Information & State Key Laboratory of High Performance Computing,College of Computer Science and Technology,National University of Defense Technology,Changsha 410073,China

NanoLund and Division of Solid State Physics,Lund University,Lund S-22100,Sweden

Hefei National Laboratory Hefei 230088,China

China Greatwall Quantum Laboratory,Changsha 410006,China

Institut de Física Interdisciplinària i de Sistemes Complexos IFISC,Palma de Mallorca E-07122,Spain

lnstituto de Ciencia de Materiales de Madrid,Madrid 28049,Spain

Beijing Key Laboratory of Quantum Devices,Key Laboratory for the Physics and Chemistry of Nanodevices,and Department of Electronics,Peking University,Beijing 100871,China

Beijing Academy of Quantum Information Sciences,Beijing 100193,China

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Swedish Research Council(VR)National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaBeijing Academy of Quantum Information SciencesHunan Provincial Science Foundation for Distinguished Young ScholarsInnovation Program for Quantum Science and TechnologySpanish Ministry of Economy and CompetitivenessMara de Maeztu projectMara de Maeztu projectSpanish Ministry of Economy and CompetitivenessCSIC Research Platform PTI-001 and through the grant LINKB20072(CSIC)

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2024

10.1007/s11433-024-2382-1

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(8)