Coherent destruction of tunneling in graphene irradiated by elliptically   polarized lasers
  Photo-induced transition probabilities in graphene are studied theoretically from the viewpoint of Floquet theory. Conduction band populations are computed for a strongly, periodically driven graphene sheet under linear, circular, and elliptic polarization. Features of the momentum spectrum of excited quasi-particles can be directly related to the avoided crossing of the Floquet quasi-energy levels. In particular, the impact of the ellipticity and the strength of the laser excitation on the avoided crossing structure -- and on the resulting transition probabilities -- is studied. It is shown that the ellipticity provides an additional control parameter over the phenomenon of coherent destruction of tunneling in graphene, allowing one to selectively suppress multiphoton resonances. 
Denis Gagnon, Fran\c{c}ois Fillion-Gourdeau, Joey Dumont, Catherine   Lefebvre, Steve MacLean
cond-mat.mes-hall physics.optics quant-ph