Abstract
We consider the subband dispersions and the spin relaxation times for holes in semiconductor heterostructures without a common atom. We show that the interface asymmetry in such structures leads to a breaking of the parity degeneracy of the Luttinger dispersions. We calculate that the resulting spin splitting induces a D'yakonov-Perel' spin relaxation mechanism that can be up to five orders of magnitude faster than the one considered hitherto.
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