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Paper   IPM / Physic / 13871
School of Physics
  Title:   Kondo resonance from p-wave hybridization in graphene
  Author(s): 
1.  S.A. Jafari
2.  T. Tohyama
  Status:   Published
  Journal: J. Physics: Condens. Matter
  Vol.:  26
  Year:  2014
  Pages:   415601
  Supported by:  IPM
  Abstract:
The p-wave hybridization in graphene present a distinct class of Kondo problem in pseudogap Fermi systems with bath density of states (DOS) ρ)0(\eps) ∝ |\eps|. The peculiar geometry of substitutional and hollow-site ad-atoms, and effectively the vacancies allow for a p-wave form of momentum dependence in the hybridization of the associated local orbital with the Dirac fermions of the graphene host which results in a different picture than the s-wave momentum independent hybridization. For the p-wave hybridization function, away from the Dirac point we find closed-form formulae for the Kondo temperature TK which in contrast to the s-wave case is non-zero for any value of hybridization strength V of the single impurity Anderson model (SIAM). At the Dirac point where the DOS vanishes, we find a conceivably small value of Vmin above which the Kondo screening takes place even in the presence of particle–hole symmetry. We also show that the non-Lorentzian line shape of the local spectrum arising from anomalous hybridization function leads to much larger TK in vacant graphene compared to a metallic host with similar bandwidth and SIAM parameters.


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