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Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature

Author

Listed:
  • Yuhang Jiang

    (Rutgers University)

  • Po-Wei Lo

    (National Taiwan University
    National Center for Theoretical Sciences
    Cornell University)

  • Daniel May

    (Technische Universität Dortmund)

  • Guohong Li

    (Rutgers University)

  • Guang-Yu Guo

    (National Taiwan University
    National Center for Theoretical Sciences)

  • Frithjof B. Anders

    (Technische Universität Dortmund)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Jinhai Mao

    (Rutgers University
    Institute of Physics & University of Chinese Academy of Sciences, Chinese Academy of Sciences)

  • Eva Y. Andrei

    (Rutgers University)

Abstract

In normal metals the magnetic moment of impurity-spins disappears below a characteristic Kondo temperature which marks the formation of a cloud of conduction-band electrons that screen the local-moment. In contrast, moments embedded in insulators remain unscreened at all temperatures. What then is the fate of magnetic-moments in intermediate, pseudogap systems, such as graphene? Theory predicts that coupling to the conduction-band electrons will drive a quantum phase transition between a local-moment phase and a Kondo-screened phase. However, attempts to experimentally confirm this prediction and its intriguing consequences, such as electrostatically tunable magnetic-moments, have been elusive. Here we report the observation of Kondo-screening and the quantum phase-transition between screened and unscreened phases of vacancy magnetic moments in graphene. Using scanning tunneling spectroscopy and numerical renormalization-group calculations we show that this transition enables to control the screening of local moments by tuning the gate voltage and the local curvature of the graphene membrane.

Suggested Citation

  • Yuhang Jiang & Po-Wei Lo & Daniel May & Guohong Li & Guang-Yu Guo & Frithjof B. Anders & Takashi Taniguchi & Kenji Watanabe & Jinhai Mao & Eva Y. Andrei, 2018. "Inducing Kondo screening of vacancy magnetic moments in graphene with gating and local curvature," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04812-6
    DOI: 10.1038/s41467-018-04812-6
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    Cited by:

    1. W. Simeth & Z. Wang & E. A. Ghioldi & D. M. Fobes & A. Podlesnyak & N. H. Sung & E. D. Bauer & J. Lass & S. Flury & J. Vonka & D. G. Mazzone & C. Niedermayer & Yusuke Nomura & Ryotaro Arita & C. D. Ba, 2023. "A microscopic Kondo lattice model for the heavy fermion antiferromagnet CeIn3," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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