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Emergence of Kondo Resonance in Graphene Intercalated with Cerium.

  • Author(s): Hwang, Jinwoong;
  • Kim, Kyoo;
  • Ryu, Hyejin;
  • Kim, Jingul;
  • Lee, Ji-Eun;
  • Kim, Sooran;
  • Kang, Minhee;
  • Park, Byeong-Gyu;
  • Lanzara, Alessandra;
  • Chung, Jinwook;
  • Mo, Sung-Kwan;
  • Denlinger, Jonathan;
  • Min, Byung Il;
  • Hwang, Choongyu
  • et al.
Abstract

The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid and its relation to magnetism. Kondo effect, the formation of a new resonant ground state with quenched magnetic moment, provides a general framework to describe many-body interaction in the presence of magnetic impurity. In this Letter, a combined study of angle-resolved photoemission (ARPES) and dynamic mean-field theory (DMFT) on Ce-intercalated graphene shows that Ce-induced localized states near Fermi energy, EF, hybridized with the graphene π-band, exhibit gradual increase in spectral weight upon decreasing temperature. The observed temperature dependence follows the expectations from the Kondo picture in the weak coupling limit. Our results provide a novel insight how Kondo physics emerges in the sea of two-dimensional Dirac electrons.

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