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Les liens vers les livrables et les publications des projets du 7e PC, ainsi que les liens vers certains types de résultats spécifiques tels que les jeux de données et les logiciels, sont récupérés dynamiquement sur OpenAIRE .
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Results
1. The self-organised growth of quantum dots of III-V has been consolidated by MBE and has been demonstrated by MOCVD. Controlled doping is now possible and laser structures have been grown by MOCVD. Enhancement of exciton binding energies by up to factors of 3 has been consistently observed. The study of exciton relaxation shows clear evidence for multiphonon processes, which appear to be at the centre of exciton trapping and recombination within the quantum dots and/or within the quantum dots and their surrounding volume. The observation of strong multiphonon processes is one key evidence to understand the efficient lasing characteristics of self-organised quantum dot lasers.
2. Submonolayer growth has been consolidated in III-V, and developed in II-VIby MBE and MOCVD. The optical studies of these structures have revealed unambiguously the combined character of excitons in these structures: excitons are localised as well as partly confined. This result is backed up by magnetooptical studies up to 40T. This duality of the excitons in submonolayer structures has been shown to increase dramatically their oscillator strength to the point of observing lasing action in submonolayer II-VI structures. CW and time-resolved studies have been carried out to explain the exciton dynamics. Astrong dependence of the resonant luminescence vis-a-vis Raman scattering has been found depending on the states directly photoexcited. Most of the experimental evidences suggest a 1D Character of the excitons in submonolayer samples.
3. The understanding of photoassisted growth of II-VI heterostructures has been considerably advanced as shown by the excellent optical characteristics. Theoptical studies in these structures has been extremely important to underpin the findings in submonolayer structures and self-organised quantum dots. Complementary structural characterisation has been performed, however the determination of a direct correlation is still in progress. The growth challenges cannot be underestimated and in our experience the multiple -growth approach taken by our project has yielded excellent underlying science of growth, exciton localisation and confinement and their relationship to laser structures.
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