Substrate-induced phonon frequency shifts of (Si)4/(Ge)4superlattices
- 12 March 1990
- journal article
- letter
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 2 (10), 2473-2477
- https://doi.org/10.1088/0953-8984/2/10/017
Abstract
The substrate-induced phonon frequency shifts of strained (Si)4/(Ge)4 superlattices, grown pseudomorphically on a (001)-oriented Si1-xGex(0<or=x<or=1) substrate at the zone centre, are studied by the Keating model. It is found that the longitudinal modes decrease almost linearly with an increase in the Ge fraction factor x and the transverse modes increase linearly.Keywords
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