Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Graphene and Carbon Nanotubes

TT 21.10: Vortrag

Dienstag, 26. Februar 2008, 18:15–18:30, EB 202

Scrutinizing the conductance and noise of ac driven carbon-based nanostructures — •Luis Foa Torres and Gianaurelio Cuniberti — Institute for Materials Science, Dresden University of Technology, D-01062 Dresden, Germany.

Time-dependent excitations provide an opportunity to achieve control through selective excitations, opening an avenue for both fundamental research and practical applications. Due to their outstanding electrical properties, carbon-based nanostructures offer an ideal playground to study such phenomena in low dimensions. Here we focus on the effects of ac driving on the conductance and the shot noise of single walled carbon nanotubes and graphene nanoribbons. Our calculations, which are based on Floquet theory and take into account the full electron dynamics, are aimed to bridge the gap between theory and recent experiments carried out in the Fabry-Perot regime. Numerical results are complemented by analytical calculations based on a simplified model. The effects of decoherence are further explored by using a phenomenological model.