Emergence of Kondo resonance in graphene intercalated with cerium

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, $E_{\mathrm{F}}$, hybridized with the graphene $\pi$ 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.

17 pages, 4 figures

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• Correlation-Driven Electron-Hole Asymmetry in Graphene Field Effect Devices
• Flat and Correlated Plasmon Bands in Graphene/$\alpha$-RuCl${}_3$ Heterostructures
• Ferromagnetic induced Kondo effect in graphene with a magnetic impurity
• Breakdown of heavy quasiparticles in a honeycomb Kondo lattice: A quantum Monte Carlo study
• Sublattice symmetry breaking and Kondo-effect enhancement in strained graphene
• Emergence of strain-induced moiré patterns and pseudo-magnetic field confined states in graphene
• Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
• Tunable Kondo resonance at a pristine two-dimensional Dirac semimetal on a Kondo insulator
• Cerium doped graphene-based materials towards oxygen reduction reaction catalysis