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Boltzmann transport and residual conductivity in bilayer graphene Shaffique Adam and S. Das Sarma
 

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 20742-4111, USA
Received 7 November 2007; revised manuscript received 24 December 2007; published 21 March 2008
A Drude-Boltzmann 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 short-range 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 self-consistent Thomas-Fermi screening approxi-
mation, to be n~ 0.01 qTF
2
140 1010
cm-2
. 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

  

Source: Adam, Shaffique - Condensed Matter Theory Center, University of Maryland at College Park

 

Collections: Physics