We develop a theory for density, disorder, and temperature-dependent electrical conductivity of bilayer graphene in the presence of long-range charged impurity scattering and short-range defect scattering, establishing that both contribute significantly to determining bilayer transport properties. We find that although strong screening properties of bilayer graphene lead to qualitative differences with the corresponding single-layer situation, both systems exhibit the approximately linearly density-dependent conductivity at high density and the minimum conductivity behavior around the charge neutrality point due to the formation of inhomogeneous electron-hole puddles. The importance of short-range disorder in determining bilayer conductivity is a qualitative finding of our work.

• Received 7 December 2009

DOI:https://doi.org/10.1103/PhysRevB.81.161407