Coulomb interaction, ripples, and the minimal conductivity of graphene.

@article{Herbut2008CoulombIR,
  title={Coulomb interaction, ripples, and the minimal conductivity of graphene.},
  author={Igor F. Herbut and Vladimir Juri{\vc}i{\'c} and Oskar Vafek},
  journal={Physical review letters},
  year={2008},
  volume={100 4},
  pages={
          046403
        }
}
We argue that the unscreened Coulomb interaction in graphene provides a positive, universal, and logarithmic correction to scaling of zero-temperature conductivity with frequency. The combined effect of the disorder due to wrinkling of the graphene sheet and the long-range electron-electron interactions is a finite positive contribution to the dc conductivity. This contribution is disorder strength dependent and thus nonuniversal. The low-energy behavior of such a system is governed by the line… 

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