Photoinduced magnetooptical response in monolayer transition metal dichalcogenides

Abstract

Magnetooptical effects, manifesting the interactions between the light and magnetic materials, enable a wide range of the potential applications in sensing, optical isolators, switches as well as data storages. The emergence of monolayer transition metal dichalcogenides allows the alternative chances to unravel their magnetooptical effects under the application of the magnetic field. Here, without relying on the magnetic field, we demonstrate the generation of the magnetooptical effect in monolayer transition metal dichalcogenides driven by the irradiation of an off-resonant circularly polarized light, which breaks the limitation of the absence of the magnetooptical effect in the pristine ones. We find that the induced optical Hall conductivity of monolayer transition metal dichalcogenides can be engineered by the effective energy term depending on the amplitude and frequency of the circularly polarized light. Furthermore, we also present the efficient control of the optical Hall conductivity in monolayer transition metal dichalcogenides by its chemical potential. Our results establish an effective way to produce the remarkable magnetooptical effects in monolayer transition metal dichalcogenides and the avenue for next-generation applications via two-dimensional layered materials.