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Electrically Controllable Kondo Correlation in Spin-Orbit-Coupled Quantum Point Contacts

Luke W. Smith, Hong-Bin Chen, Che-Wei Chang, Chien-Wei Wu, Shun-Tsung Lo, Shih-Hsiang Chao, I. Farrer, H. E. Beere, J. P. Griffiths, G. A. C. Jones, D. A. Ritchie, Yueh-Nan Chen, and Tse-Ming Chen
Phys. Rev. Lett. 128, 027701 – Published 10 January 2022
Physics logo See synopsis: Electrically Controlling the Kondo Effect
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Abstract

Integrating the Kondo correlation and spin-orbit interactions, each of which have individually offered unprecedented means to manipulate electron spins, in a controllable way can open up new possibilities for spintronics. We demonstrate electrical control of the Kondo correlation by coupling the bound spin to leads with tunable Rashba spin-orbit interactions, realized in semiconductor quantum point contacts. We observe a transition from single to double peak zero-bias anomalies in nonequilibrium transport—the manifestation of the Kondo effect—indicating a controlled Kondo spin reversal using only spin-orbit interactions. Universal scaling of the Kondo conductance is demonstrated, implying that the spin-orbit interactions could enhance the Kondo temperature. A theoretical model based on quantum master equations is also developed to calculate the nonequilibrium quantum transport.

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  • Received 15 June 2021
  • Accepted 2 December 2021

DOI:https://doi.org/10.1103/PhysRevLett.128.027701

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

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Electrically Controlling the Kondo Effect

Published 10 January 2022

Spin-polarized electrons can suppress the experimental signature of the quantum many-body phenomenon known as the Kondo effect.

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Authors & Affiliations

Luke W. Smith1, Hong-Bin Chen1,2,3, Che-Wei Chang1, Chien-Wei Wu1, Shun-Tsung Lo1,4, Shih-Hsiang Chao1, I. Farrer5,6, H. E. Beere5, J. P. Griffiths5, G. A. C. Jones5, D. A. Ritchie5, Yueh-Nan Chen1,3, and Tse-Ming Chen1,3,*

  • 1Department of Physics, National Cheng Kung University, Tainan 701, Taiwan
  • 2Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan
  • 3Center for Quantum Frontiers of Research and Technology (QFort), National Cheng Kung University, Tainan 701, Taiwan
  • 4Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 300, Taiwan
  • 5Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
  • 6Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom

  • *tmchen@phys.ncku.edu.tw

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Vol. 128, Iss. 2 — 14 January 2022

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