  In this paper, by considering the Hubbard model on a honeycomb lattice, we
developed a theory for the intrinsic magnetic impurities (MIs) with the
quasi-localized spin moments induced by the vacancies in graphene. Because the
intrinsic MIs are characterized by the zero modes that are rthotropic to the
itinerant electrons, their properties are much different from those of Anderson
MIs with the well-localized spin moments.
