Phys. Rev. Lett. 99, 216602 (2007) [4 pages]Minimum Electrical and Thermal Conductivity of Graphene: A Quasiclassical ApproachReceived 13 June 2007; published 21 November 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.216602
DOI:
10.1103/PhysRevLett.99.216602
PACS:
72.10.−d, 72.80.Rj, 73.50.Lw, 81.05.Uw
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