Vortex Core States in Superconducting Graphene
  The distinctive features of the electronic structure of vortex states in superconducting graphene are studied within the Bogolubov-de Gennes theory applied to excitations near the Dirac point. We suggest a scenario describing the subgap spectrum transformation which occurs with a change in the doping level. For an arbitrary vorticity and doping level we investigate the problem of existence of zero energy modes. The crossover to a Caroli - de Gennes - Matricon type of spectrum is studied. 
I.M.Khaymovich, N.B.Kopnin, A.S.Mel'nikov, I.A.Shereshevskii