Percolation versus cluster models for multimode vibration spectra of mixed crystals: GaAsP as a case study

Pagès, O.; Souhabi, Jihane; Postnikov, A. V.; Chafi, A.

doi:10.1103/physrevb.80.035204

Cited by 44 publications

(53 citation statements)

References 37 publications

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“…When examining the nature of the IR/Raman behavior of such a complex system as a disordered semiconductor alloy, our preference is to focus on TO's [5]. This is because the TO's detected by IR absorption or in a Raman experiment done in the conventional backscattering geometry consist of purely-mechanical vibrations, referred to as PM-TO's hereafter.…”

Section: Summary Of the Current Literature On Phonon Properties Of Sementioning

confidence: 99%

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Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

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Section: Summary Of the Current Literature On Phonon Properties Of Sementioning

confidence: 99%

“…L due to the partially ionic character of the chemical bonding in a zincblende crystal, are more complicated to understand [6]. This is because close LO's couple via their common electric field, which obscures the phonon mode behavior [5].…”

Section: Summary Of the Current Literature On Phonon Properties Of Sementioning

confidence: 99%

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

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“…At the end of the dependence and for very diluted alloys, the modes correspond to the local vibrational modes (LV) of the impurities (GaSb:As, GaAs:Sb, respectively). This two-mode and LV behavior has been observed for most of III-V alloys, such as AlGaAs, AlGaSb, GaAsP, InAlAs or InGaP [25,26].…”

Section: Alloy Phonon Modesmentioning

confidence: 99%

Raman spectroscopy of self-catalyzed GaAs_1−xSb_xnanowires grown on silicon

Alarcón-Lladó¹,

Conesa‐Boj²,

Wallart³

et al. 2013

Nanotechnology

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Thanks to their wide band structure tunability, GaAs 1−x Sb x nanowires provide exciting perspectives in optoelectronic and energy harvesting applications. The control of composition and strain of these ternary alloys is crucial in the determination of their optical and electronic properties. Raman scattering provides information on the vibrational properties of materials, which can be related to the composition and strain. We present a systematic study of the vibrational properties of GaAs 1−x Sb x nanowires for Sb contents from 0 to 44%, as determined by energy-dispersive x-ray analyses. We find that optical phonons red-shift with increasing Sb content. We explain the shift by alloying effects, including mass disorder, dielectric changes and ionic plasmon coupling. The influence of Sb on the surface optical modes is addressed. Finally, we compare the luminescence yield between GaAs and GaAs 1−x Sb x , which can be related to a lower surface recombination rate. This work provides a reference for the study of ternary alloys in the form of nanowires, and demonstrates the tunability and high material quality of gold-free ternary antimonide nanowires directly grown on silicon.

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“…An obvious analogy exists between the three schemes, indicating that the traditional MREI-VCA/Elliott-CPA classification has in fact no raison dêtre, and can be unified within the percolation scheme (see also Ref. [159]). …”

Section: Phonons (Zone-center): a Natural Mesoscope Into The Alloy DImentioning

confidence: 99%

Optical Spectroscopy Methods and High‐Pressure–High‐Temperature Studies

Polian

Simon

Pagès³

2010

Thermodynamic Properties of Solids

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This chapter aims to show how optical spectroscopies contribute to the study of vibrational properties under extreme conditions. Now, what do we mean by extreme conditions? We can take it in the other way and mention that ambient conditions have nothing more special as to permit life on earth -that is already not bad! From the point of view of physics, no particular property occurs at ambient conditions. On the contrary, most of the matter in the universe is under extreme pressure (P) and temperature (T), as it is in planets, stars, and more exotic objects. Studies at high pressure and high temperature are hence only the study of matter in its normal conditions. The reason why geoscientists are much interested in such studies is self-explanatory, but other fields are widely studied. The application of high pressure and high temperature enables to explore the repulsive part of the potential energy (fundamental physics), to provoke phase transformations thereby leading to new structures eventually metastable at ambient conditions (materials sciences), to orient chemical reactions in requested directions (chemistry), and even to crystallize proteins, that otherwise would not happen by using other techniques (biology). Another interest to work under variable conditions is that, obviously, more insight is given into the considered phenomenon, in that the pressure and/or temperature derivatives of the phenomenon become available, thus offering a more complete picture to achieve optimum understanding and/or modeling.There are mainly five experimental methods to probe the vibrational properties of matter: optical spectroscopies (of main interest here), ultrasonics (US), inelastic neutron scattering (INS, cf. Chapter 3), more recently inelastic X-ray scattering (IXS, cf. Chapter 4) -that was made possible due to the introduction of third generation synchrotron radiation facilities -and picosecond (PS) acoustics.INS and IXS are used to determine the dispersion of vibration modes, that is, acoustical as well as optical ones, over the whole Brillouin zone (BZ). The most stringent limitations are the needed sources (national-size ones, i.e., a nuclear reactor for INS and a monochromatized X-ray beam as delivered by a synchrotron for IXS), and a limitation to small momentum transfer (q < 0.1q BZB , where q is the magnitude of the wavevector and BZB is the BZ boundary). An additional limitation for INS is

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Percolation versus cluster models for multimode vibration spectra of mixed crystals: GaAsP as a case study

Cited by 44 publications

References 37 publications

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Raman spectroscopy of self-catalyzed GaAs_1−xSb_xnanowires grown on silicon

Optical Spectroscopy Methods and High‐Pressure–High‐Temperature Studies

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Percolation versus cluster models for multimode vibration spectra of mixed crystals: GaAsP as a case study

Cited by 44 publications

References 37 publications

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Raman spectroscopy of self-catalyzed GaAs1−xSbxnanowires grown on silicon

Optical Spectroscopy Methods and High‐Pressure–High‐Temperature Studies

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Product

Resources

About

Raman spectroscopy of self-catalyzed GaAs_1−xSb_xnanowires grown on silicon