Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/2076
Title: Near-forward/high-pressure-backward Raman study of Zn1-xBexSe (x similar to 0.5) - evidence for percolation behavior of the long (Zn?Se) bond
Authors: Dicko, H.
Pages, O.
Hussein, R. Hajj
Pradhan, G. K.
Narayana, Chandrabhas
Firszt, F.
Marasek, A.
Paszkowicz, W.
Maillard, A.
Jobard, C.
Broch, L.
Hassan, F. El Hajj
Keywords: Spectroscopy
ZnBeSe
percolation
phonon-polariton
pressure
near-forward scattering
Mixed-Crystals
Alloys
Polaritons
Scattering
Model
Semiconductors
Chalcogenides
Spectroscopy
Dispersion
Phonons
Issue Date: 2016
Publisher: Wiley-Blackwell
Citation: Dicko, H.; Pages, O.; Hussein, R. H.; Pradhan, G. K.; Narayana, C.; Firszt, F.; Marasek, A.; Paszkowicz, W.; Maillard, A.; Jobard, C.; Broch, L.; Hassan, F. E., Near-forward/high-pressure-backward Raman study of Zn1-xBexSe (x similar to 0.5) - evidence for percolation behavior of the long (Zn?Se) bond. Journal of Raman Spectroscopy 2016, 47 (3), 357-367 http://dx.doi.org/10.1002/jrs.4817
Journal of Raman Spectroscopy
47
3
Abstract: The apparently universal 1-bond2-mode percolation behavior in the Raman spectra of zincblende semiconductor alloys is generally observed for the short bond only, and not for the long one. In this work we perform a combined high-pressure-backward/near-forward Raman study of the leading percolation-type (Zn,Be)Se alloy (50at.% Be), which exhibits a distinct percolation doublet in the spectral range of its short Be?Se bond, in search of a Zn?Se analogue. The high-pressure-backward insight is not conclusive per se, but clarifies the perspective behind the near-forward Raman study. The latter reveals an unique Zn?Se phonon-polariton. Its fair contour modeling depending on the scattering angle is achieved within the linear dielectric approach, based on ellipsometry measurement of the ZnBeSe refractive index. Somewhat surprisingly this reveals that the phonon-polariton in question is a fractional' one in that it carries only half of the available Zn?Se oscillator strength, as ideally expected in case of a BeSe-like bimodal Raman behavior of the long Zn?Se bond. Copyright (c) 2015 John Wiley & Sons, Ltd.
Description: Restricted Access
URI: http://hdl.handle.net/10572/2076
ISSN: 0377-0486
Appears in Collections:Research Articles (Chandrabhas N.)

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