Radiation effects on the electronic properties of bilayer graphene

Eric Suárez Morell and Luis E. F. Foa Torres
Phys. Rev. B 86, 125449 – Published 28 September 2012

Abstract

We report on the effects of laser illumination on the electronic properties of bilayer graphene. By using Floquet theory combined with Green's functions, we unveil the appearance of laser-induced gaps not only at integer multiples of Ω/2 but also at the Dirac point with features which are shown to depend strongly on the laser polarization. Trigonal warping corrections are shown to lead to important corrections for radiation in the terahertz range, reducing the size of the dynamical gaps. Furthermore, our analysis of the topological properties at low energies reveals that, when irradiated with linearly polarized light, ideal bilayer graphene behaves as a trivial insulator, whereas circular polarization leads to a nontrivial insulator per valley.

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  • Received 6 June 2012

DOI:https://doi.org/10.1103/PhysRevB.86.125449

©2012 American Physical Society

Authors & Affiliations

Eric Suárez Morell1 and Luis E. F. Foa Torres2,*

  • 1Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
  • 2Instituto de Física Enrique Gaviola (IFEG-CONICET) and FaMAF, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina

  • *Corresponding author: lfoa@famaf.unc.edu.ar

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Vol. 86, Iss. 12 — 15 September 2012

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