| We study the influence of surface deformations on the optical conductivity of the two-dimensional Dirac electron gas aiming at the description of the tansport properties in graphene. Deformations of the two-dimensional space are taken into account by introducing a nonabelian gauge boson field into the Eucledian action of two-dimensional Dirac electrons. Furthermore the interplay between the Coulomb interaction and a gap in the spectrum of graphene is investigated by means of the functional renormalization group methodology. |
|