Abstract
Both the transfer matrix and Green’s function methods have been used during the last few years to investigate the acoustic vibrations in superlattices.1 The extended states which propagate in the whole superlattice form bulk bands which are separated by smaL.L. gaps (superlattice effect): localised states associated with a perturbation of the perfect superlattice may exist inside these gaps. We have considered the case of defects which conserve the symmetry of translation parallel to the layers, namely a free surface, an interface with a substrate, and a planar defect.
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References
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© 1991 Springer Science+Business Media New York
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Rouhani, B.D., Khourdifi, E.M. (1991). Localised and Extended Acoustic Waves in Superlattices Light Scattering by Longitudinal Phonons. In: Lockwood, D.J., Young, J.F. (eds) Light Scattering in Semiconductor Structures and Superlattices. NATO ASI Series, vol 273. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3695-0_11
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