Electric Transport Theory of Dirac Fermions in Graphene
arXiv:0708.1569 · doi:10.1103/PhysRevB.77.125409
Abstract
Using the self-consistent Born approximation to the Dirac fermions under finite-range impurity scatterings, we show that the current-current correlation function is determined by four-coupled integral equations. This is very different from the case for impurities with short-range potentials. As a test of the present approach, we calculate the electric conductivity in graphene for charged impurities with screened Coulomb potentials. The obtained conductivity at zero temperature varies linearly with the carrier concentration, and the minimum conductivity at zero doping is larger than the existing theoretical predictions, but still smaller than that of the experimental measurement. The overall behavior of the conductivity obtained by the present calculation at room temperature is similar to that at zero temperature except the minimum conductivity is slightly larger.
arXiv comment6 pages, 3 figures
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- Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation
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- Anomalous Magnetism for Dirac Electrons in Two Dimensional Rashba Systems
- Plasmon damping rates in Coulomb-coupled two-dimensional layers in a heterostructure