Abstract
Response of electronic systems in intense lights (ac electric fields) to dc source-drain fields is formulated with the Floquet method. We have then applied the formalism to graphene, for which we show that a nonlinear effect of a circularly polarized light can open a gap in the Dirac cone, which is predicted to lead to a photoinduced dc Hall current. This is numerically confirmed for a graphene ribbon attached to electrodes with the Keldysh Green’s function.
- Received 29 July 2008
DOI:https://doi.org/10.1103/PhysRevB.79.081406
©2009 American Physical Society
Physics Subject Headings (PhySH)
Condensed Matter, Materials & Applied Physics