 
Summary: Boltzmann transport and residual conductivity in bilayer graphene
Shaffique Adam and S. Das Sarma
Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 207424111, USA
Received 7 November 2007; revised manuscript received 24 December 2007; published 21 March 2008
A DrudeBoltzmann theory is used to calculate the transport properties of bilayer graphene. We find that for
typical carrier densities accessible in graphene experiments, the dominant scattering mechanism is over
screened Coulomb impurities that behave like shortrange scatterers. We anticipate that the conductivity n
is linear in n at high density and has a plateau at low density corresponding to a residual density of n*
= nimpn~, where n~ is a constant which we estimate, using a selfconsistent ThomasFermi screening approxi
mation, to be n~ 0.01 qTF
2
140 1010
cm2
. Analytic results are derived for the conductivity as a function of
the charged impurity density. We also comment on the temperature dependence of the bilayer conductivity.
DOI: 10.1103/PhysRevB.77.115436 PACS number s : 81.05.Uw, 72.10. d, 73.40. c
I. INTRODUCTION
The recent experimental realization of a single layer of
carbon atoms arranged in a honeycomb lattice has prompted
much excitement in both the theoretical and experimental
