Selection rules of Raman scattering by optical phonons in strained cubic crystals

 
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1997 (EN)
Selection rules of Raman scattering by optical phonons in strained cubic crystals (EN)

Anastassakis, E (EN)

N/A (EN)

Strain characterization of materials through Raman spectroscopy often requires the optical phonon wave vector to be in directions other than those of the strain-modified phonon eigenvectors. As a result, the observed mode frequencies are mixtures of the strain-modified eigenfrequencies. The selection rules for such generalized scattering configurations are derived here for the strained zincblende-diamond family crystals. The formulation is based on the relative magnitude of the LO-TO and the strain-induced splittings. The results are important for the analysis of strain-modified Raman lineshapes and of ''forbidden'' lines. Specific examples;are worked out in derail for externally stressed bulk crystals (90 degrees scattering geometry), and for [001], [111], and [110] strained heterojunctions (backscattering under oblique incidence and/or detection). (C) 1997 American Institute of Physics. (EN)

journalArticle

SPECTROSCOPY (EN)
HETEROSTRUCTURES (EN)
ANGULAR-DISPERSION (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Journal of Applied Physics (EN)

1997


AMER INST PHYSICS (EN)



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