▎ 摘　　要

The present work investigates the excitonic effects on the bilayer graphene with layers of different thickness under the influence of external electric field through a simple numerical approach. The band structure and energy gap have been calculated using a tight-binding model including parameters like the second-nearest-neighbor-hopping energies t' (in-plane) and gamma (intra-layer) and the on-site energy Delta, in details. The binding energy of exciton for bilayer graphene has been calculated by Wannier model and Hartree-Fock approximation through the Bethe-Salpeter equation. Finally the optical conductivity spectrum of bilayer graphene has been calculated by using the effective mass approximation in two band model. (C) 2013 Elsevier GmbH. All rights reserved.