Abstract
We study theoretically acoustic phonon modes in nanowire superlattices (NWSLs)composed of cubic materials. We classify the acoustic phonon modes in rectangular andsquare cross-section NWSLs, based on group theory. For NWSLs consisting of GaAs andAlAs, we calculate numerically the dispersion relations of each phonon mode andcorresponding displacement fields. We examine the effects of both the lateral confinementand superlattice modulation along the wire axis. The results suggest that peculiarelectron–phonon interactions occur because the vibrations of both the lateral andlongitudinal confining potentials induce scattering potential in addition to the deformationand piezoelectric potentials.
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