  The role of staggered potential on light-induced spin and pseudo-spin
polarization has been investigated in silicene. It has been shown that
non-equilibrium spin and pseudo-spin polarizations are emerged in silicene
sheet by applying an external perpendicular electric field in the presence of
circularly polarized light emission. This electric field results in pseudo-spin
resolved states very close to the Dirac points therefore could be considered as
a pseudomagnetic field. It has been shown that staggered potential induced
spin-valley locking and pseudo-spin resolved bands are responsible for
enhancement of the spin and pseudo-spin polarizations. Meanwhile, spin-valley
locking suggests a coexistence of both spin and valley polarizations with
nearly identical population imbalance at low Fermi energies which could be
employed for magnetic detection of the valley polarization. It has been shown
that spin-valley locking results in protection of the spin polarizations
against the relaxations in elastic scattering regime. In addition results
indicate that the pseudo-spin current can be generated by the circularly
polarized light which could be explained by asymmetric light absorption of the
states in k-space.
