Les phonons : un 'mésoscope' naturel pour l'étude du désordre d'alliage

Abstract : We demonstrate how to overcome serious problems of understanding and classifcation of vibration spectra in semiconductor alloys, following from traditional use of the Virtual Cristal Approximation (VCA). We show that such different systems as InGaAs (1- bond!1-phonon behavior), InGaP (modifed 2-phonon) and ZnTeSe (2-bond 1-phonon) obey, in fact, the same phonon mode behavior, hence probably a universal one, of a percolation type (1-bond!2-phonon, developed in our group). The change of paradigm from the VCA (macroscopic scale) to the Percolation (mesoscopic scale) reveals a specificity of zone-center phonons, that is to provide natural insight into the alloy disorder at the unusual mesoscopic scale. In fact, we introduce a terminology, and say that these phonons behave as a true 'MESOSCOPE'. In particular, this opens up new perspectives for studying the effects of long-range spontaneous organization in mixed crystals, ranging from segregation (InGaP2) to anti-segregation (GaInAsN).
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Allal Chafi. Les phonons : un 'mésoscope' naturel pour l'étude du désordre d'alliage. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 2008. Français. ⟨NNT : 2008METZ034S⟩. ⟨tel-01752601⟩

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