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We investigate silicene superlattices in the presence of a tunable barrier potential U , an exchange field M , and a perpendicular electric field Ez. The resulting miniband structure depends on the spin and valley indices and on the fields M and Ez. These fields determine the minigaps and also affect the additional Dirac points brought about by the periodic potential U . In addition, we consider diffusive transport and assess its dependence on the spin and valley indices as well as on temperature. The corresponding spin and valley polarizations strongly depend on the potential U and can be made almost 100% at very low temperatures at particular values of the Fermi energy.

Spin- and valley-dependent miniband structure and transport in silicene superlattices