Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation

Details Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation

2010-09-13

arxiv.org/abs/1009.2512v2

Phys. Rev. B82: 245418,2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Minor typos corrected, journal ref. added

Scientific paper

10.1103/PhysRevB.82.245418

Spectral and transport properties of doped (or gated) graphene with long range charged impurities are discussed within the self-consistent Born approximation. It is shown how, for impurity concentrations $n_{imp}\gtrsim n$ a finite DOS appears at the Dirac point, the one-particle lifetime no longer scales linearly with the Fermi momentum, and the lineshapes in the spectral function become non-lorentzian. These behaviors are different from the results calculated within the Born approximation. We also calculate the optical conductivity from the Kubo formula by using the self-consistently calculated spectral function in the presence of charged impurities.

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