On optical field driven quantum spin Hall phase in Bi_۲Se_۳ thin film with magnetic Impurities

The normal incidence of circularly polarized optical field (POF) of tunable intensity on the topological insulator Bi۲Se۳ film is shown to give rise to the quantum spin Hall (QSH) effect, in the presence of the magnetic impurities (MI), starting with a low-energy two-dimensional, time-dependent Hamiltonian in the framework of the Floquet theory. The quantized topological number- the Kane–Mele index Z۲ for QSH phase- strongly support this topological state.

کلیدواژه ها:

Circularly polarized optical field ، Floquet theory ، Magnetic impurities ، Kane– Mele index Z۲ ، Quantum spin Hall phase