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Interférences Raman et Nanostructures

Abstract : The control of matter at the nanometer length scale opens a wide field of studies. The determination of the nanostructure structural properties, their organization rate and the influence of these parameters on their electronic properties remain a foremost challenge. To obtain these data, one usually requires a set of experimental and numerical techniques often complicated to implement. In this work, we study the organization and the electronic confinement in quantum dot multilayers combining experiments and modelisations. Raman interferences observed in the frequency range of acoustic phonons originate in the interaction between acoustic waves and electronic states confined in quantum dots. These interferences are an efficient tool to investigate structural and electronic properties of nanostructures, on length scales ranging from a few to a few hundreds of nanometers. Raman interferences use it to measure the structural and electronic properties. Thus, the vertical and in-plane organization can be determined in quantum dot multilayers. We have developed a general model with an application field, extending from structures with a few quantum dot layers to superlattices. Using the Fourier transform of the Raman interferences, we measure the autocorrelation function of the electronic density along the growth axis. Sensitive to the dimensions and the distribution of the electronic density, Raman interferences lead the way for the optic investigation of the electronic density.
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Contributor : Maximilien Cazayous <>
Submitted on : Monday, October 21, 2002 - 5:03:38 PM
Last modification on : Friday, January 10, 2020 - 9:10:04 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:01:28 PM


  • HAL Id : tel-00001850, version 1



Maximilien Cazayous. Interférences Raman et Nanostructures. Physique [physics]. Université Paul Sabatier - Toulouse III, 2002. Français. ⟨tel-00001850⟩



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