Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 62: [TT] Transport: Graphene 1 (jointly with MA, HL, DY, DS, O)
O 62.6: Talk
Thursday, March 29, 2012, 10:45–11:00, BH 334
Coulomb drag in graphene via kinetic equation approach — •Michael Schuett1, Pavel M. Ostrovsky1,2, Igor V. Gornyi1,3, Mikhail Titov4, Boris N. Narozhny5, and Alexander D. Mirlin1,5,6 — 1Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — 2L. D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia — 3A.F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia. — 4School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK — 5Institut für Theorie der kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 6Petersburg Nuclear Physics Institute, 188350 St. Petersburg, Russia.
We calculate the Coulomb drag resistivity at finite temperature for two graphene monolayers within the kinetic equation approach. The emphasis is put on the case of fast electron-electron collisions compared to disorder induced scattering. We obtain the asymptotic behavior of the Coulomb drag resistivity ρD both for small chemical potentials (µ1,µ2) in the two layers as well as chemical potentials larger than temperature. When only one layer is at the Dirac point the Coulomb drag resistivity is zero. However when approaching the Dirac point of both layers simultaneously, the Coulomb drag resistivity does not vanish as long as µ1∝µ2→ 0. For any finite disorder strength or alternating current Coulomb drag resistivity obeys again ρD(µ1=0,µ2=0)=0, as expected from the particle hole symmetry argument. When both layers have large chemical potentials we recover the Fermi liquid behavior.