Controllable photoenhanced spin- and valley-polarized transport in ferromagnetic MoS2 junction

We propose fully valley- and spin-polarized currents in a normal/ferromagnetic/normal MoS2 junction by applying a circularly polarized light in the off-resonance regime in the ferromagnetic (FM) region. It is found that the circularly polarized light and exchange field remove the valley and spin degeneracies of the conduction band edges, respectively. In this situation, by choosing appropriate values for gate voltage, the Fermi level intersects with one valley form one spin channel leading to the fully valley- and spin-polarized currents through the proposed junction. Interestingly, the sign of both valley and spin polarizations can be easily switched from -100% to 100% by varying the intensity of the circularly polarized light and gate voltage. The full valley- and spin-polarized currents provide desirable routines to construct spin/valley filter for MoS2 based devices.