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Physica E 40 (2008) 10221025 Scattering mechanisms and Boltzmann transport in graphene$

Summary: Physica E 40 (2008) 10221025
Scattering mechanisms and Boltzmann transport in graphene$
Shaffique Adam, E.H. Hwang, S. Das Sarma
Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111, USA
Available online 22 September 2007
Different scattering mechanisms in graphene are explored and conductivity is calculated within the Boltzmann transport theory. We
provide results for short-range scattering using the random phase approximation for electron screening, as well as analytical expressions
for the dependence of conductivity on the dielectric constant of the substrate. We further examine the effect of ripples on the transport
using a surface roughness model developed for semiconductor heterostructures. We find that close to the Dirac point, s$nb
, where
b 1; 0; 2 for Coulomb, short-range and surface roughness, respectively; implying that Coulomb scattering dominates over both short-
range and surface roughness scattering at low density.
r 2007 Elsevier B.V. All rights reserved.
PACS: 72.10.d; 81.05.Uw; 73.63.b
Keywords: Graphene; Boltzmann transport; Ripples
1. Introduction
Over the last two years, there has been a proliferation in
theoretical and experimental interest in graphene. Gra-
phene is a two-dimensional sheet of carbon atoms arranged


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


Collections: Physics