Kondo effect of an adatom in graphene and its scanning tunneling spectroscopy

Abstract

We study the Kondo effect of a single magnetic adatom on the surface of graphene. It was shown that the unique linear dispersion relation near the Dirac points in graphene makes it more easy to form the local magnetic moment, which simply means that the Kondo resonance can be observed in a more wider parameter region than in the metallic host. The result indicates that the Kondo resonance indeed can form ranged from the Kondo regime, to the mixed valence, even to the empty orbital regime. While the Kondo resonance displays as a sharp peak in the first regime, it has a peak-dip structure and/or an anti-resonance in the remaining two regimes, which result from the Fano resonance due to the significant background leaded by dramatically broadening of the impurity level in graphene. We also study the scanning tunneling microscopy (STM) spectra of the adatom and they show obvious particle-hole asymmetry when the chemical potential is tuned by the gate voltages applied to the graphene. Finally, we explore the influence of the direct tunneling channel between the STM tip and the graphene on the Kondo resonance and find that the lineshape of the Kondo resonance is unaffected, which can be attributed to unusual large asymmetry factor in graphene. Our study indicates that the graphene is an ideal platform to study systematically the Kondo physics and these results are useful to further stimulate the relevant experimental studies on the system.

8 pages, 5 figures

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Cited by in corpus (8)

• Emergence of Kondo resonance in graphene intercalated with cerium
• Catching the Bound States in the Continuum of a Phantom Atom in Graphene
• Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field
• Sublattice symmetry breaking and Kondo-effect enhancement in strained graphene
• Reentrant Kondo effect in a quantum impurity coupled to a metal-semiconductor hybrid contact
• From Kondo to local singlet state in graphene nanoribbons with magnetic impurities
• Programmable Kondo Effect Formed by Landau Levels
• Fano-shaped impurity spectral density, electric-field-induced in-gap state and local magnetic moment of an adatom on trilayer graphene