Kondo impurity on the honeycomb lattice at half-filling

Abstract

We consider a Kondo-like impurity interacting with fermions on a honeycomb lattice at half-filling, as in the case of graphene. We derive from the lattice model an effective one-dimensional continuum theory which has, in general, four flavors with angular momentum mixing in the presence of internode scattering processes and six couplings in the spin-isotropic case. Under particular conditions, however, it can be reduced to a single-coupling multichannel pseudogap Kondo model. We finally calculate, in the presence of an energy dependent Fermi velocity, induced by Coulomb interaction, the critical coupling in the large-N expansion, the magnetic susceptibility and the specific heat.

18 pages, no figures

References in corpus (10)

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• Quantum phase transitions and thermodynamics of the power-law Kondo model
• Kondo effect in monolayer and bilayer graphene: physical realizations of the multi-channel Kondo models
• Magnetic adatoms on graphene in the Kondo regime: an Anderson model treatment
• Junction of three off-critical quantum Ising chains and two-channel Kondo effect in a superconductor
• Transmission phase shifts of Kondo impurities
• Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field
• Kondo effect due to a hydrogen impurity in graphene: a multichannel Kondo problem with diverging hybridization
• Topological view on magnetic adatoms in graphene
• Single-impurity Kondo physics at extreme particle-hole asymmetry
• Electric field control of spins in bilayer graphene: Local moment formation and local moment interactions