I was just looking over the Atomic, Solid State, Comp. Physics forum where ZapperZ was replying to a question about growing crystal lattices and said "the lattice mismatch is actually desirable because it produces a strain in the film that breaks the degeneracy of the crystal, allowing for the production of spin-polarized photoelectrons.". https://www.physicsforums.com/showthread.php?p=1326599#post1326599"
So I did a little googling on spin-polarized photoelectrons production and found out that spintronics is an application for these photoelectrons. You might want to ask ZapperZ.