Abstract
Using the case of electron scattering by screened charge pairs as a guide, we derived a criterion for conditions under which coherent multi-ion interference becomes important. However, it is shown that the single-site theory which ignores interference effects often gives excellent agreement with experimental mobilities for relatively compensated GaAs and InSb in some regions where this criterion is strongly violated. These seemingly contradictory results indicate the need for a fundamentally different approach to the scattering problem when the separation distance of the impurities is small compared to the screening length.
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