  In this work, we study the spin polarization in the $MoS(Se)_{2}-WS(Se)_{2}$
Transition metal dichalcogenide heterostructures by using the non-equilibrium
Green's function (NEGF) method and a three-band tight-binding model near the
edges of the first Brillouin zone. Although it has been shown that the
structures have no significant spin polarization in a specific range of energy
of electrons, by applying a transverse electric field in the sheet of the metal
atoms, shedding light on the sample, and under a small bias voltage, a
significant spin polarization in the structure could be created. Besides, by
applying a suitable bias voltage between leads and applying the electric field
a noticeable spin polarization can be found even without shedding the light on
the heterostructures.
