  We study massive Dirac fermion tunneling through time periodic potential in a
silicene-based N-TP-N junction, where Ns are normal silicene regions and TP is
the time periodic potential barrier. The fermions would absorb or emit photons
due to the presence of the Floquet sidebands created in the TP. The nearly
perfect spin-valley-sideband filtering is predicted. Applying only the exchange
field leads to just only the electron absorbing a single photon almost purely
allowed to tunnel through the junction for the large electric field. Reversing
direction of electric field can select spin of the allowed electron. In the
case of applying only off-resonant circularly polarized light, just only the
electron absorbing a single photon with spin up, is almost purely allowed to
tunnel through the junction. The valley is also selected by reversing direction
of the electric field. The controllable sideband channel may be applicable for
sideband-based spin-valleytronics.
