Minimum electrical and thermal conductivity of graphene: a quasiclassical approach.
We investigate the minimum conductivity of graphene within a quasiclassical approach taking into account electron-hole coherence effects which stem from the chiral nature of low energy excitations. Relying on an analytical solution of the kinetic equation in the electron-hole coherent and incoherent cases, we study both the electrical and the thermal conductivity whose relation satisfies the Wiedemann-Franz law. We find that most of the previous findings based on the Boltzmann equation are restricted to only high mobility samples where electron-hole coherence effects are not sufficient.
Trushin
Maxim
M
Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany.
Schliemann
John
J