Abstract
We have carried out full-scale semiempirical relativistic pseduopotential calculations of the frequency dependence---spanning the midinfrared to far infrared range of frequencies---of ${\mathrm{\ensuremath{\chi}}}^{(2)}$(-2\ensuremath{\omega};\ensuremath{\omega},\ensuremath{\omega}) associated with excitations between valence minibands in p-type GaAs-AlAs and Si-SiGe heterostructures. We find that the spectrum is dominated by excitations lying further from the center of the Brillouin zone and depends on states lying above the semiclassical barrier.
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