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A self-consistent theory for graphene transport Shaffique Adam

Summary: A self-consistent theory for graphene transport
Shaffique Adam
, E. H. Hwang, V. M. Galitski, and S. Das Sarma
Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742-4111
Edited by Ellen D. Williams, University of Maryland, College Park, MD, and approved October 1, 2007 (received for review May 23, 2007)
We demonstrate theoretically that most of the observed transport
properties of graphene sheets at zero magnetic field can be
explained by scattering from charged impurities. We find that,
contrary to common perception, these properties are not universal
but depend on the concentration of charged impurities nimp. For
dirty samples (250 1010 cm 2 < nimp < 400 1010 cm 2), the value
of the minimum conductivity at low carrier density is indeed 4e2/h
in agreement with early experiments, with weak dependence on
impurity concentration. For cleaner samples, we predict that the
minimum conductivity depends strongly on nimp, increasing to
8e2/h for nimp 20 1010 cm 2. A clear strategy to improve
graphene mobility is to eliminate charged impurities or use a
substrate with a larger dielectric constant.
Boltzmann transport electron transport minimum conductivity
The past two years have seen a proliferation of theoretical and


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


Collections: Physics