Temperature dependence of the diffusive conductivity of bilayer graphene

TL;DR

This paper models how temperature affects the diffusive conductivity of bilayer graphene, revealing a disorder-dependent scaling behavior that aligns with experimental data.

Contribution

It introduces a theoretical framework linking temperature dependence of conductivity to disorder levels in bilayer graphene.

Findings

Conductivity depends on T/T* scaling.

Experimental data collapse onto the predicted scaling function.

Temperature dependence varies with disorder strength.

Abstract

Assuming diffusive carrier transport and employing an effective medium theory, we calculate the temperature dependence of bilayer graphene conductivity due to Fermi-surface broadening as a function of carrier density. We find that the temperature dependence of the conductivity depends strongly on the amount of disorder. In the regime relevant to most experiments, the conductivity is a function of T/T*, where T* is the characteristic temperature set by disorder. We demonstrate that experimental data taken from various groups collapse onto a theoretically predicted scaling function.