Identification of magnetic state of transition metal dichalcogenides via photonic spin Hall effect

Abstract

Monolayer transition metal dichalcogenides with magnetic exchange fields have been demonstrated to display the remarkable valley polarization and magnetooptical behaviors. However, the explorations of their photonic spin Hall effects are lacking. Here, we show that the reflected spin shift of monolayer transition metal dichalcogenides with magnetic exchange field is significantly different from that of the pristine one and it exhibits the distinctive dependence on the size of the magnetic exchange field. In addition, we can manipulate the reflected spin shift of monolayer transition metal dichalcogenides with the magnetic exchange field via its chemical potential. This work unravels the potential of the photonic spin Hall effect on identifying the magnetic state of monolayer transition metal dichalcogenides or the substrate, which might promote their potential applications in the spin photonic devices.