We test a presumed ability behind the phenomenological percolation scheme used for the basic description of the multi-mode Raman spectra of mixed crystals at one dimension along the linear chain approximation, to determine, via the Raman intensities, the nature of the atom substitution, as to whether this is random or due to local clustering/anticlustering. For doing so, we focus on the model percolation-type GeySi1−y system characterized by six oscillators and place the study around the critical compositions ∼ (0.16, 0.71, and 0.84) corresponding to nearly matching of intensities between the like Raman modes from a given multiplet ( triplet or doublet). The interplay between the GeySi1−y Raman intensities predicted by the percolation scheme depending on a suitable order parameter of local clustering/anticlustering is found to be consistent with ab initio calculations of the GeySi1−y Raman spectra done with the Ab Initio Modeling PROgram code using large (64-, 216-, and 512-atoms) disordered cubic supercells matching the required values. The actual “percolation vs. ab initio” comparative insight at moderate/dilute-(Ge,Si) limits, with an emphasis on the -induced intra-bond transfer of oscillator strength, extends a pioneering one earlier achieved at an intermediate composition ( ∼ 0.50) by using small (32-atom) supercells [O. Pagès et al., J. Appl. Phys. 114, 033513 (2013)], mainly concerned with the inter-bond transfer of oscillator strength, providing altogether a complete picture.
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28 February 2017
Research Article|
February 23 2017
Clustering/anticlustering effects on the GeSi Raman spectra at moderate (Ge,Si) contents: Percolation scheme vs. ab initio calculations
V. J. B. Torres
;
V. J. B. Torres
1Departamento de Fisica and I3N,
Universidade de Aveiro
, Campus Santiago, 3810-193 Aveiro, Portugal
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R. Hajj Hussein;
R. Hajj Hussein
2LCP-A2MC, Institut Jean Barriol,
Université de Lorraine
, Metz 57078, France
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O. Pagès;
O. Pagès
a)
2LCP-A2MC, Institut Jean Barriol,
Université de Lorraine
, Metz 57078, France
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M. J. Rayson
M. J. Rayson
3School of Electrical, Electronic and Computer Engineering,
Newcastle University
, Newcastle Upon Tyne NE1 7RU, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 121, 085704 (2017)
Article history
Received:
November 14 2016
Accepted:
February 05 2017
Citation
V. J. B. Torres, R. Hajj Hussein, O. Pagès, M. J. Rayson; Clustering/anticlustering effects on the GeSi Raman spectra at moderate (Ge,Si) contents: Percolation scheme vs. ab initio calculations. J. Appl. Phys. 28 February 2017; 121 (8): 085704. https://doi.org/10.1063/1.4976861
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