Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 7: Graphene 1 (Joint Session with TT)
HL 7.6: Talk
Monday, March 22, 2010, 11:45–12:00, H18
Graphene: Relativistic transport in a nearly perfect quantum liquid — •Lars Fritz1, Markus Mueller2, Joerg Schmalian3, and Subir Sachdev4 — 1Universitaet zu Koeln, Institut fuer theoretische Physik, Zuelpicher Strasse 77, 50937 Koeln — 2The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy — 3Department of Physics and Astronomy Iowa State University Ames, Iowa 50011, USA — 4Harvard University, 17 Oxford Street, Cambridge, MA 02138, USA
Electrons and holes in clean, charge-neutral graphene behave like a strongly coupled relativistic liquid. The thermo-electric transport properties of the interacting Dirac quasiparticles are rather special, being constrained by an emergent Lorentz covariance at hydrodynamic frequency scales. At small carrier density and high temperatures, graphene exhibits signatures of a quantum critical system with an inelastic scattering rate set only by temperature, a conductivity with a nearly universal value, solely due to electron-hole friction, and a very low viscosity. In this regime one finds pronounced deviations from standard Fermi liquid behavior. These results, obtained by Boltzmann transport theory at weak electron-electron coupling, are fully consistent with the predictions of relativistic hydrodynamics.