Theory of Defect-Induced Kondo Effect in Graphene: Numerical   Renormalization Group Study
  An effective model that describes the Kondo effect due to a point defect in graphene is developed, taking account of the electronic state and the lattice structure of the defect. It is shown that this model can be transformed into a single-channel pseudogap Anderson model with a finite chemical potential. On the basis of the numerical renormalization group method, it is clarified that the experimentally observed gate-voltage dependence of the Kondo temperature is understood in this framework. 
Taro Kanao, Hiroyasu Matsuura, Masao Ogata
cond-mat.mtrl-sci cond-mat.mes-hall cond-mat.str-el