Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.7: Poster

Monday, March 26, 2012, 15:00–19:00, Poster B

Tuning the electronic structure and transport properties in carbon-based devices — •Hernan L. Calvo¹, Claudia G. Rocha^2,3, Horacio M. Pastawski⁴, Stephan Roche⁵, Gianaurelio Cuniberti³, and Luis E.F. Foa Torres⁴ — ¹Institut für Theorie der Statistischen Physik, RWTH Aachen University, 52056 Aachen, Germany — ²Department of Physics, NanoScience Center, University of Jyväskylä, Jyväskylä 40014, Finland — ³Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, Dresden D-01062, Germany — ⁴IFEG-CONICET, FaMAF, Universidad Nacional de Córdoba, Argentina — ⁵CIN2 (ICN-CSIC), Universidad Autónoma de Barcelona, Campus UAB, 08193 Bellaterra (Barcelona), and ICREA, 08070 Barcelona, Spain

Thanks to their outstanding electrical, mechanical and thermal properties, research in carbon-based materials is one of the most rapidly advancing fronts ever. In this work, we study the effects a time-periodic potential induces on the electronic structure and transport properties in graphene and carbon nanotubes. By combining Floquet theory with Green's function formalism, we describe two different situations: (1) the generation of laser-induced band gaps in graphene and (2) the enhancement of the pumped current in carbon nanotubes. For the first case, we show how the band gaps can be tuned by using the laser polarization and describe a strong suppression in the conductance. For the second case, we observe an enhancement of the pumped current by up to two orders of magnitude when gating the system close to a van Hove singularity (vHs).