Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-02
Physica E 40, 1022 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To be published in Physica E as EP2DS-17 conference proceedings
Scientific paper
10.1016/j.physe.2007.09.064
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, \sigma \sim n^\beta, where \beta=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.
Adam Shaffique
Hwang Euyheon H.
Sarma Sankar Das
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