We study the effect of driving a two-dimensional honeycomb system out of equilibrium using an elliptically polarized light as a time-dependent perturbation. In particular, we try to understand the topological phase diagram of this driven system when the external drive is a vector potential given by A ( t ) = ( A 0 x cos ( Ω t ) , A 0 y cos ( Ω t + ϕ 0 ) ) . These topological phases are characterized by the Floquet Chern number which, in each of these phases, is related to the number of robust edge modes on a nanoribbon. We show that varying the ratio A 0x /A 0y of the external drive is a possible way to take the system from a trivial to a topological phase and vice versa.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Polymers and Plastics
- Metals and Alloys