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Open Access Publications from the University of California

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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