Diffusive transport in graphene: the role of interband correlation

Details Diffusive transport in graphene: the role of interband correlation Diffusive transport in graphene: the role of interband correlation

2007-07-04

arxiv.org/abs/0707.0559v3

Physics

Condensed Matter

Materials Science

7 pages, 1 figure; discussion concerning the effects of interband correlation added

Scientific paper

10.1063/1.2969787

We present a kinetic equation approach to investigate dc transport properties of graphene in the diffusive regime considering long-range electron-impurity scattering. In our study, the effects of interband correlation (or polarization) on conductivity are taken into account. We find that the conductivity contains not only the usual term inversely proportional to impurity density $N_i$, but also an anomalous term that is linear in $N_i$. This leads to a minimum in the density dependence of conductivity when the electron density $N_{\rm e}$ is equal to a critical value, $N_c$. For $N_{\rm e}>N_c$ the conductivity varies almost linearly with the electron density, while it is approximately inversely proportional to $N_{\rm e}$ when $N_{\rm e}

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