Substrate and capping layer effects on the phonon spectrum of ultrathin superlattices

Lockwood, D. J.; Dharma-wardana, M. W. C.; Aers, G. C.; Baribeau, J.-M.
June 1988
Applied Physics Letters;6/13/1988, Vol. 52 Issue 24, p2040
Academic Journal
GemSin ultrathin superlattices have been grown on (001) Si substrates and partly capped with Si. Raman scattering from acoustic phonons in the long-wavelength region shows unexpectedly intense broad peaks that develop into an increased number of sharper intense peaks on capping. We identify these peaks with resonant phonon modes and use a linear chain model to expose the importance of substrate-superlattice-capping layer interactions in these multilayer structures.


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