Emergence of Kondo Resonance in Graphene Intercalated with Cerium

ORAL

Abstract

The interaction of a magnetic impurity with surrounding electrons has been a core problem in modern physics to understand fundamentals of many-body effects and its relation to magnetism. In particular, antiferromagnetic screening of the local magnetic moment by conduction electrons leads to the formation of a new resonant-type many-body ground state, so-called Kondo resonance. Here we report the realization of the Kondo resonance in a prototypical two-dimensional system, graphene, induced by the presence of cerium with the localized spin of a 4felectron. The combination of two complementary techniques, angle-resolved photoemission spectroscopy and dynamic mean-field theory, reveals the development of new spectral weight near Fermi energy at lower temperature that is hybridized with the graphene π-band. The observed T-dependence provides not only a direct evidence of the formation of the many-body ground state in graphene, but also novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

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Presenters

  • Jinwoong Hwang

    • Pusan National University

Authors

  • Jinwoong Hwang

    • Pusan National University

  • Kyoo Kim

    • Physics, POSTECH
    • Max Planck-POSTECH/Hsinchu Center for Complex Phase Materials
    • MPPC_CPM, Pohang University of Science and Technology, Pohang, 37673, Korea

  • Hyejin Ryu

    • Lawrence Berkeley National Laboratory
    • Lawrance Berkeley National Laboratory
    • Lawrence Berkeley Nat. Lab

  • Jingul Kim

    • Pohang University of Science and Technology

  • Ji-Eun Lee

    • Pusan National University

  • Sooran Kim

    • Pohang University of Science and Technology
    • Harvard University

  • Minhee Kang

    • Pusan National University

  • Byung Il Min

    • Pohang University of Science and Technology
    • physics, Pohang University of Science and Technology
    • Department of Physics, Pohang University of Science and Technology
    • Department of Physics, Pohang University of Science and Technology (POSTECH)
    • Department of Physics, Pohang University of Science and Technology, Pohang, 37673, Korea

  • Alessandra Lanzara

    • UC Berkeley
    • University of California, Berkeley
    • Physics, University of California, Berkeley

  • Jinwook Chung

    • Pohang University of Science and Technology

  • Sung-Kwan Mo

    • ALS
    • Lawrence Berkeley National Laboratory
    • Lawrance Berkeley National Laboratory
    • Lawrence Berkeley Nat. Lab
    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Jonathan Denlinger

    • ALS, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Labotatory
    • Advanced Light Source, Lawrence Berkeley National Laboratory
    • Lawrence Berkeley Natl Lab

  • Byeong-Gyu Park

    • Pohang Accelerator Laboratory

  • Choongyu Hwang

    • Pusan National University