Raman scattering from surface and bulk acoustic phonons in capped superlattices

H. J. Trodahl; P. V. Santos; G. V. M. Williams; A. Bittar

doi:10.1103/PhysRevB.40.8577

Rapid Communication

Raman scattering from surface and bulk acoustic phonons in capped superlattices

H. J. Trodahl, P. V. Santos, G. V. M. Williams, and A. Bittar

Phys. Rev. B 40, 8577(R) – Published 15 October 1989

Abstract

Raman spectra from capped amorphous Ge/SiO superlattices have been found to display lines arising from surface vibrations within the frequency gaps of the zone folded phonons. The frequency and intensity of the lines have been followed while varying the thickness of the capping layer, and are shown to depend sensitively on this thickness. The strengths of the folded-phonon doublet are also found to depend on the capping layer. The data are described well by an elastic continuum model for acoustic vibrations in a superlattice.

Received 6 June 1989

DOI:https://doi.org/10.1103/PhysRevB.40.8577

Authors & Affiliations

H. J. Trodahl

Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80, Federal Republic of Germany
Department of Physics, Victoria University of Wellington, Post Office Box 600, Wellington, New Zealand

P. V. Santos