Intervalley scattering by charged impurities in graphene

TL;DR

This paper investigates how charged impurities cause intervalley scattering in graphene, revealing that Coulomb interactions significantly enhance scattering probability depending on electron energy and interaction strength.

Contribution

It introduces a theoretical analysis showing the Coulomb interaction's role in enhancing intervalley scattering in graphene due to charged impurities.

Findings

Scattering probability is increased by Coulomb interaction.

Enhancement factor depends on electron energy and Coulomb interaction strength.

Provides a quantitative expression for the Sommerfield factor.

Abstract

Intervalley charged-impurity scattering processes are examined. It is found that the scattering probability is enhanced due to the Coulomb interaction with the impurity by the Sommerfield factor $F_Z\propto \epsilon^{2\sqrt{1-4g^2}-2}$, where $\epsilon$ is the electron energy and $g$ is the dimensionless constant of the Coulomb interaction.