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

TL;DR

This paper develops a Floquet theory-based computational approach to study how intense laser illumination non-perturbatively affects the electronic properties of graphene nanoribbons, revealing sharp conductance and density of states features.

Contribution

It introduces an efficient computational scheme for analyzing non-perturbative laser effects on graphene nanoribbons' electronic properties.

Findings

Laser-induced transitions cause sharp features in conductance.

Finite size effects interplay with laser excitation to modify electronic states.

Bulk limit response emerges under certain conditions.

Abstract

The use of Floquet theory combined with a realistic description of the electronic structure of illuminated graphene and graphene nanoribbons is developed to assess the emergence of non-adiabatic and non-perturbative effects on the electronic properties. Here, we introduce an efficient computational scheme and illustrate its use by applying it to graphene nanoribbons in the presence of both linear and circular polarization. The interplay between confinement due to the finite sample size and laser-induced transitions is shown to lead to sharp features on the average conductance and density of states. Particular emphasis is given to the emergence of the bulk limit response.