Raman-scattering probe of anharmonic effects in GaAs

Verma, Prabhat; Abbi, S. C.; Jain, Kavita

doi:10.1103/physrevb.51.16660

Cited by 90 publications

(48 citation statements)

References 10 publications

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“…It has been confirmed the inverse relation between the lifetime and the anharmonic constants. 22 From Table I, it is obvious that the constants A and B increase with the increase of Al content. It can be explained that Al atom incorporation makes the more lattice defect and structural disorder which lead to shorten lifetime of decay process.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of temperature, the thermal agitation increases, giving rise to a decrease in the phonon mean free path, and so the decay lifetime (τ) decreases. 22 The relation between decay lifetime and full width at half maximum (FWHM: Γ) can be written as τ = 1/(πcΓ), where c is velocity of light. Thus, FWHM increases with increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

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Temperature dependence of Raman scattering in β-(AlGa)2O3 thin films

et al. 2016

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We report a detailed investigation on temperature-dependent Raman scattering of β-(AlGa)2O3 thin films with different Al content (0-0.72) under the temperature range of 77-300 K. The temperature-dependent Raman shifts and linewidths of the phonon modes were obtained by employing Lorentz fitting. The linewidths broadening of phonon modes with the temperature can be well explained by a model involving the effects of thermal expansion, lattice-mismatch-induced strain, and decay of optical phonon into two and three phonons. It is clearly demonstrated dependence of the linewidths and decay process on the Al content in β-(AlGa)2O3 thin films, which can provide an experimental basis for realization of (AlGa)2O3-based optoelectronic device applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Temperature dependence of Raman scattering in β-(AlGa)2O3 thin films

et al. 2016

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“…40 The line-width analysis of real materials is more difficult to achieve since different contributions have to be considered. Among these, the finite resolution of the spectrometer, 41 impurities and defects disturb the translation symmetry of the harmonic crystal. 40 All these factors along with the anharmonic decay of phonons account for the broadening observed.…”

Section: à6mentioning

confidence: 99%

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Pandey

Samanta

Singh

et al. 2014

Journal of Applied Physics

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Pressure and temperature dependent Raman scattering studies on Ho2O3 have been carried out to investigate the structural transition and the anharmonic behavior of the phonons. Ho2O3 undergoes a transition from cubic to monoclinic phase above 15.5 GPa, which is partially reversible on decompression. The anharmonic behavior of the phonon modes of Ho2O3 from 80 K to 440 K has been investigated. We find an anomalous line-width change with temperature. The mode Grüneisen parameter of bulk Ho2O3 was estimated from high pressure Raman investigation up to 29 GPa. Furthermore, the anharmonic components were calculated from the temperature dependent Raman scattering.

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“…The Raman spectra of various amorphous or crystalline materials show changes in line position and bandwidth with temperature [1][2][3][4]. This changes manifest in shift of line position and a change in line width and intensity.…”

Section: Introductionmentioning

confidence: 99%

Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy

Dohčević‐Mitrović

Popović²,

Šćepanović³

2009

Acta Phys. Pol. A

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Phonon-phonon interactions were investigated in various nanocrystalline powders like anatase TiO 2−δ , pure CeO 2−δ and ceria doped with Nd(Gd) analyzing temperature dependent Raman spectra of these systems. Phonon confinement model based on size, inhomogeneous strain and anharmonic effects was used to properly describe the evident changes present in the Raman spectra of pure and doped ceria nanocrystalline samples. In small particles of pure and doped ceria nanocrystals, when size effects have minor impact on Raman modes, four phonon anharmonic processes prevail under the three-phonon ones. When nanopowdered particles are grown enough size effects provoke changes of the anharmonic interactions when three-phonon coupling prevails over the four-phonon anharmonic processes. In nanocrystalline anatase TiO 2 evident blueshift of the most prominent E g Raman mode probably originates from dominant four-phonon anharmonic interactions.

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Raman-scattering probe of anharmonic effects in GaAs

Cited by 90 publications

References 10 publications

Temperature dependence of Raman scattering in β-(AlGa)2O3 thin films

Temperature dependence of Raman scattering in β-(AlGa)2O3 thin films

Raman scattering of rare earth sesquioxide Ho2O3: A pressure and temperature dependent study

Anharmonicity Effects in Nanocrystals Studied by Raman Scattering Spectroscopy

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