Perfect spin-valley polarization and magnetoresistance in MoS₂ tunnel junction with circularly polarized light

Abstract

We study the spin-valley dependent transport and magnetoresistance effect in a ferromagnetic MoS2 junction modulated by the off-resonance circularly polarized light. It is found that the conductance could be 100% spin- and valley-polarized simultaneously in the P configuration. Perfect valley polarization can also be realized in the AP configuration. The spin polarization presents a oscillating behavior in AP configuration due to the spin-orbit coupling. Furthermore, the junction achieves a high magnetoresistance that can be controlled by the exchange field and the light.