The acoustoelectric effect in a semiconductor superlattice has been studied for an acoustic wave whose wavelength lambda =2 pi /q is smaller than the mean free path l of the electrons (where ql>>1). Unlike the homogeneous bulk material where the Weinreich relation is independent of the wavenumber q in the superlattice we observe a dependence on q, i.e. spatial dispersion. In the presence of an applied constant field E a threshold value was obtained where the acoustoelectric current changes direction.
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Mensah et al. (1994) studied this question.
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