Optical and electric control of spin and valley polarization transport in magnetic WSe₂ superlattice

The magnetic WSe₂ superlattice system is examined here to explore effects of non-resonant circularly polarized light and gate voltage on tunneling, spin and valley polarization． Manipulation of ballistic transport in single-layer WSe₂, as well as control of the quantum transport in the periodic array of NM-FM-NM junctions based on magnetic WSe₂ are identified． The critical value of circularly polarized light is found to eliminate the transmission energy gap by increasing the number of potential barriers． The circularly polarized light and gate voltage could be regarded as a transmission valve and a sensitive knob for controlling the spin and valley polarization. Klein tunneling in WSe₂ super lattice is spin-valley dependent． Spin-valley polarization can be adjusted and converted by grid voltage and circularly polarized light．