(Poster) Non-perturbative laser effects on the electrical properties of graphene nanoribbons

HERNAN L. CALVO; PABLO M. PEREZ-PISKUNOV; HORACIO M. PASTAWSKI; STEPHAN ROCHE; LUIS E.F. FOA TORRES

Regensburg

Conferencia; 77th Annual Meeting of the Deutsche Physikalische Gesellschaft; 2013

Deutsche Physikalische Gesellschaft

We study the interplay between lateral confinement and photoninducednon-adiabatic processes on the electronic properties of laserilluminatedgraphene 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 $\Omega$ may either not affect the electronic structure, or induce bandgaps or depletions at $\pm \hbar \Omega/2$, 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.