Thursday, February 28, 2008, 1:30 pm — Small Seminar Room, Bldg. 510
We analyze the competing effects of moderate to strong Coulomb electron-electron interactions and weak quenched disorder in graphene. Using a one-loop renormalization
group calculation controlled within the large-N approximation, we demonstrate that, at successively lower energy scales, a type of non-Abelian vector potential disorder always asserts itself as the dominant elastic scattering mechanism for generic short-ranged
microscopic defect distributions. Vector potential disorder is tied to both elastic lattice deformations
("ripples") and topological lattice defects. We identify several well-defined scaling regimes,for which we provide scaling predictions for the electrical conductivity and thermopower, valid when the inelastic lifetime due to interactions exceeds the elastic lifetime due to disorder.
Coulomb interaction effects should figure strongly into the physics of suspended graphene films; we expect vector potential disorder to play an important role in the
description of transport in such films.
Hosted by: Alexei Tsvelik
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