  Non-equilibrium spin-polarized transport properties of antiferromagnetic
stanene nanoribbons are theoretically studied under the combining effect of a
normal electric field and linearly polarized irradiation based on the
tight-binding model at room temperature. Due to the existence of spin-orbit
coupling in stanene lattice, applying normal electric field leads to splitting
of band degeneracy of spin-resolved energy levels in conduction and valence
bands. Furthermore, unequivalent absorption of the polarized photons at two
valleys which is attributed to an antiferromagnetic exchange field results in
unequal spin-polarized photocurrent for spin-up and spin-down components.
Interestingly, in the presence of band bending which has been induced by edge
potentials, an allowable quantum efficiency occurs over a wider wavelength
region of the incident light. It is especially important that the variation of
an exchange magnetic field generates spin semi-conducting behavior in the
bended band structure. Moreover, it is shown that optical spin-filtering effect
is obtained under the simultaneous effect of uniaxial strain and narrow edge
potential.
