We demonstrated theoretically that the renormalization of the electron energy spectrum near the Dirac point of graphene by a strong high-frequency electromagnetic field (dressing field) drastically depends on polarization of the field. Namely, linear polarization results in an anisotropic gapless energy spectrum, whereas circular polarization leads to an isotropic gapped one. As a consequence, the stationary (dc) electronic transport in graphene strongly depends on parameters of the dressing field: A circularly polarized field monotonically decreases the isotropic conductivity of graphene, whereas a linearly polarized one results in both giant anisotropy of conductivity (which can reach thousands of percents) and the oscillating behavior of the conductivity as a function of the field intensity. Since the predicted phenomena can be observed in a graphene layer irradiated by a monochromatic electromagnetic wave, the elaborated theory opens a substantially new way to control electronic properties of graphene with light.
|Publication status||Published - 3 Feb 2016|
Bibliographical noteFunding Information:
The work was partially supported by FP7 IRSES projects POLATER and QOCaN, FP7 ITN project NOTEDEV, Rannis project BOFEHYSS, RFBR project 14-02-00033, the Russian Target Federal Program (project 14.587.21.0020) and the Russian Ministry of Education and Science.