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Emergence of Kondo Resonance in Graphene Intercalated with Cerium

  • Author(s): Hwang, J
  • Kim, K
  • Ryu, H
  • Kim, J
  • Lee, JE
  • Kim, S
  • Kang, M
  • Park, BG
  • Lanzara, A
  • Chung, J
  • Mo, SK
  • Denlinger, J
  • Min, BI
  • Hwang, C
  • et al.
Abstract

Copyright © 2018 American Chemical Society. 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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