GaAs/AlAs monolayer superlattices: A new candidate for a highly spin-polarized electron source

Using the results of an ab-initio self-consistent local density Dirac calculation of its electronic structure, we suggest that the GaAs/AlAs monolayer superlattice should be a good candidate for a high quality spin-polarized photoelectron source, giving a theoretical polarization of electrons of 100% together with favourable conditions for their extraction from the solid.