Quantum kinetic equation and universal conductance fluctuations in graphene

Kechedzhi, K. and Kashuba, O. and Falko, Vladimir (2008) Quantum kinetic equation and universal conductance fluctuations in graphene. Physical review B, 77 (19): 193403. ISSN 1098-0121

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Abstract

We analyze universal conductance fluctuations (UCFs) in graphene in the framework of diagrammatic perturbation theory in the metallic regime. It is shown that strong intervalley scattering lifts the valley degeneracy of electronic states, whereas at weak intervalley scattering two valleys independently contribute such that the variance of UCF would be expected to show sample- and geometry-dependent behaviors.