Interlayer asymmetry gap in the electronic band structure of bilayer graphene.

McCann, Edward (2007) Interlayer asymmetry gap in the electronic band structure of bilayer graphene. physica status solidi (b), 244 (11). pp. 4112-4117. ISSN 0370-1972

Abstract

The low-energy electronic band structure of bilayer graphene consists of four bands: a pair of bands split from zero energy by the interlayer coupling and a pair of bands which touch at zero energy in a nominally undoped system. The latter support massive, chiral quasiparticles with a parabolic dispersion and Berry phase 2. Asymmetry between the potential energies of the layers opens a tuneable gap between the conduction and valence bands. A self-consistent Hartree approximation is used to model the control of such an interlayer asymmetry gap induced by a transverse electric field in a graphene-based field-effect transistor.