▎ 摘　　要

We consider the quantum field theory approach to graphene. The model consists of the photon field in the bulk, i.e., in (3+1) dimensions, and a spinor field on a brane, i.e., in (2+1) dimensions. Integrating out the spinor field, an effective action appears, from which one has modified Maxwell equations accounting for the response of graphene. Within this model, one has the known one-loop polarization tensor allowing to investigate specific questions. Here, we consider the surface plasmons which may travel along graphene, with finite chemical potential or finite temperature.