Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Graphene 1 (Joint Session with TT)

HL 7.4: Talk

Monday, March 22, 2010, 11:00–11:15, H18

Coulomb interaction in graphene: Relaxation rates and transport — •Michael Schütt¹, Pavel Ostrovsky², Igor Gornyi², and Alexander Mirlin^1,2 — ¹Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — ²Institut für Nanotechnologie, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany

We study electron transport in graphene with Coulomb interaction at finite temperatures by using Keldysh diagrammatics. In the case of clean graphene we obtain the total scattering rate, the transport scattering rate, and the energy relaxation rate at the Dirac point. Since the total scattering rate diverges graphene exhibits a non-Fermi-liquid behavior similar to disordered metals. Unlike metals clean graphene has a finite conductivity due to the Coulomb interaction. For conductivity we obtain the same analytic behavior as was found using the Boltzmann approach [1,2]. We analyze the plasmon spectrum of graphene and formulate quantum kinetic equations to describe transport in the crossover between the Coulomb interaction dominated regime and the disorder dominated regime.

[1] L. Fritz et al., Phys. Rev. B 78:085416 (2008).

[2] A. Kashuba, Phys. Rev. B 78:085415 (2008).