Brillouin-Wigner theory for Floquet topological phase transitions in spin-orbit-coupled materials
Brillouin-Wigner theory for Floquet topological phase transitions in spin-orbit-coupled materials
We develop the high-frequency expansion based on the Brillouin-Wigner (B-W) perturbation theory for driven systems with spin-orbit coupling which is applicable to the cases of silicene, germanene, and stanene. We compute the effective Hamiltonian in the zero-photon subspace not only to order $O({\ensuremath{\omega}}^{\ensuremath{-}1})$ but by keeping all the important terms …