Screening-induced temperature-dependent transport in two-dimensional graphene

By E. Hwang. 2008

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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 $\ensuremath{\epsilon}(q,T)$ and the finite-temperature energy averaging of the transport scattering time. We find that the calculated temperature-dependent conductivity is nonmonotonic, 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1a0e97166cdc0d241bce24106e43d38c0d5e0b86