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arxiv 1307.6671 v1 pith:F3TPLCTX submitted 2013-07-25 cond-mat.mtrl-sci

Near-forward Raman scattering by bulk and surface phonon-polaritons in the model percolation-type ZnBeSe alloy

Rami Hajj Hussein , Olivier Pag\`es , Franciszek Firszt , Wojtek Paszkowicz , Alain Maillard This is my paper
classification cond-mat.mtrl-sci
keywords ramanalloybe-sebulkphonon-polaritonssurfacecorrespondingnear-forward
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We study the bulk and surface phonon-polaritons of the Zn0.67Be0.33Se zincblende alloy by near-forward Raman scattering. The short (Be-Se) bond exhibits a distinct percolation doublet in the conventional backscattering Raman spectra, corresponding to a three-mode behavior in total [1(Zn-Se),2(Be-Se)] for Zn0.67Be0.33Se. This offers an opportunity to achieve a refined understanding of the phonon-polariton modes of a zincblende alloy beyond the current two-mode approximation, corresponding to a [1(Zn-Se),1(Be-Se)] description in the present case. The discussion is supported by contour modeling of the Raman signals of the multi-mode bulk and surface phonon-polaritons within the formalism of the linear dielectric response.

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