Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.40: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Non-perturbative laser effects on the electrical properties of graphene nanoribbons — •Hernán L. Calvo1, Pablo M. Pérez Piskunow2, Horacio M. Pastawski2, Stephan Roche3,4, and Luis E. F. Foa Torres2 — 1Institut für Theorie der Statistischen Physik, RWTH Aachen University, Germany — 2Instituto de Física Enrique Gaviola (CONICET) and FaMAF, Universidad Nacional de Córdoba, Argentina — 3CIN2 (ICN-CSIC), Catalan Institute of Nanotechnology, Universidad Autónoma de Barcelona, Spain — 4Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
We study the interplay between lateral confinement and photon-induced non-adiabatic processes on the electronic properties of laser-illuminated graphene nanoribbons. By using Floquet theory applied to realistic models of these nanostructures, we predict a strong dependence on the polarization direction which is averaged out in the bulk limit. Depending on the device setup (edges geometries, ribbon width, polarization direction and metallic/semiconducting character of the sample), a laser with frequency Ω may either not affect the electronic structure, or induce bandgaps or depletions at ± ℏ Ω /2, and/or at other energies not commensurate with half the photon energy. Similar features are also observed in the dc conductance, suggesting the use of the polarization direction to switch on and off the graphene device. Our results could guide the design of novel types of optoelectronic nano-devices.