Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations  

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

机构地区：[1]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 [2]NanoLund and Division of Solid State Physics,Lund University,Lund S-22100,Sweden [3]China Greatwall Quantum Laboratory,Changsha 410006,China [4]Institut de Física Interdisciplinària i de Sistemes Complexos IFISC,Palma de Mallorca E-07122,Spain [5]Instituto de Ciencia de Materiales de Madrid,Madrid 28049,Spain [6]Beijing Key Laboratory of Quantum Devices,Key Laboratory for the Physics and Chemistry of Nanodevices,and Department of Electronics,Peking University,Beijing 100871,China [7]Beijing Academy of Quantum Information Sciences,Beijing 100193,China [8]Hefei National Laboratory,Hefei 230088,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第8期3-13,共11页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Swedish Research Council(VR);the National Natural Science Foundation of China(Grant Nos.92165208,11874071,91221202,91421303,and 11904399);the National Key Research and Development Program of China(Grant Nos.2016YFA0300601,and 2017YFA0303304);Beijing Academy of Quantum Information Sciences(Grant No.Y18G22);the financial supports by Hunan Provincial Science Foundation for Distinguished Young Scholars(Grant No.2021JJ10043);the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302401);the financial support by the Spanish Ministry of Economy and Competitiveness(Grant No.PID2020-117347GBI00);the financial supports by the Spanish Ministry of Economy and Competitiveness(Grant No.PID2020-11778GB-I00);the Mara de Maeztu project CEX2021-001164-M funded by the MCIN/AEI/10.13039/501100011033;the supports from CSIC Research Platform PTI-001 and through the grant LINKB20072(CSIC)。

摘　　要：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 Majorana 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.

关 键 词：quantum dot Kondo correlation InSb nanowire quasiparticle trapping 

分 类 号：O469[理学—凝聚态物理]