Screening induced temperature dependent transport in 2D graphene

Details Screening induced temperature dependent transport in 2D graphene Screening induced temperature dependent transport in 2D graphene

2008-11-07

arxiv.org/abs/0811.1212v1

Phys. Rev. B 79, 165404 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 9 figures

Scientific paper

10.1103/PhysRevB.79.165404

We calculate the temperature dependent conductivity of graphene in the presence of randomly distributed Coulomb impurity charges arising from the temperature dependent screening of the Coulomb disorder without any phonons. The purely electronic temperature dependence of our theory arises from two independent mechanisms: the explicit temperature dependence of the finite temperature dielectric function $\epsilon(q,T)$ and the finite temperature energy averaging of the transport scattering time. We find that the calculated temperature dependent conductivity is non-monotonic, decreasing with temperature at low temperatures, and increasing at high temperatures. We provide a critical comparison with the corresponding physics in semiconductor-based parabolic band 2D electron gas systems.

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