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TT: Fachverband Tiefe Temperaturen

TT 42: Transport: Graphene (organized by TT)

TT 42.10: Vortrag

Dienstag, 1. April 2014, 12:15–12:30, WIL C107

Non-vanishing Coulomb drag in clean double-layer graphene at the Dirac point — •Sven Aeschlimann¹, Michael Schütt², Igor Gornyi^1,2,3, Boris Narozhny¹, and Alexander Mirlin^1,2,4 — ¹Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Institut für Nanotechnologie, Karlsruhe Institute of Technology, Karlsruhe, Germany — ³A. F. Ioffe Physica-Technical Institute, St. Petersburg, Russia — ⁴Petersburg Nuclear Physics Institute, St. Petersburg, Russia

Coulomb drag is the frictional effect of simple Coulomb interaction onto two currents driven through two spatially separated conducting layers. Initiating a current through one layer, causes a current or a voltage drop in the other.

Recent experiments revealed a suprising nonvanishing resistance at the Dirac point that was expected to be zero for symmetry considerations. We focus on the possibility of a non-vanishing resistance in clean samples due to third order interaction contributions to drag.