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