▎ 摘　　要

We have performed a theoretical study of electronic transport in single and bilayer graphene based on the standard linear-response (Kubo) formalism and continuum-model descriptions of the graphene band structure. We are focusing especially on the interband contribution to the optical conductivity sigma(omega). Analytical results are obtained for a variety of situations, which allow clear identification of features in sigma(omega) that are associated with relevant electronic energy scales. Our work extends previous numerical studies and elucidates ways to infer electronic properties of graphene samples from optical-conductivity measurements. (C) 2009 Elsevier B.V. All rights reserved.