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Selection Rules for Light Scattering by Folded Acoustic Phonons in Superlattices Grown in Arbitrary Directions
Author(s) -
Anastassakis E.,
Popovic Z. V.
Publication year - 1996
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199603)27:3/4<207::aid-jrs948>3.0.co;2-i
Subject(s) - phonon , superlattice , piezoelectricity , condensed matter physics , scattering , wave vector , physics , raman scattering , phonon scattering , optics , computational physics , raman spectroscopy , acoustics
Abstract The propagation of acoustic waves in superlattices grown in arbitrary directions is considered, and a general formalism for obtaining wave velocities, selection rules and efficiency of light scattering by folded acoustic phonons is presented. Results based on nine different directions of the phonon wavevector are tabulated. Some errors found in the literature are corrected. The piezoelectric contributions to the phonon frequencies and scattering intensities are analysed. It is shown that their influence is the greatest for propagation along [111]. Changes in the elastic stiffness and Pockels coefficients due to the piezoelectric effect in GaAs are shown to be of the order of 0.1% and 1%, respectively.