Unusual quantum confinement in IV-VI materials
Type de document :
Communication dans un congrès avec actes
Titre :
Unusual quantum confinement in IV-VI materials
Auteur(s) :
Allan, Guy [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Delerue, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Titre de la manifestation scientifique :
European Materials Research Society Spring Meeting
Ville :
Strasbourg
Pays :
France
Date de début de la manifestation scientifique :
2004-05-01
Date de publication :
2004
Mot(s)-clé(s) en anglais :
Quantum wells
Quantum dots
Nanocrystals
Dielectric constant
PbSe
Quantum dots
Nanocrystals
Dielectric constant
PbSe
Discipline(s) HAL :
Sciences de l'ingénieur [physics]
Résumé en anglais : [en]
The effect of quantum confinement in PbSe quantum wells and dots is studied using tight binding calculations. Compared to zinc-blende semiconductors, unusual physical properties are predicted for rock salt PbSe nanostructures. ...
Lire la suite >The effect of quantum confinement in PbSe quantum wells and dots is studied using tight binding calculations. Compared to zinc-blende semiconductors, unusual physical properties are predicted for rock salt PbSe nanostructures. The energy gap increases as the inverse of the size both for wells and dots. For PbSe nanocrystals, the luminescence lifetime, the confinement energy and the intraband optical properties are in good agreement with experiments. The high quantum yield observed experimentally can be explained by the absence of surface dangling bonds in these systems. The full frequency-dependent dielectric function ɛ(ω) is calculated for PbSe quantum wells. Its imaginary part is strongly anisotropic and shows large variations with respect to its bulk value even far from the gap region.Lire moins >
Lire la suite >The effect of quantum confinement in PbSe quantum wells and dots is studied using tight binding calculations. Compared to zinc-blende semiconductors, unusual physical properties are predicted for rock salt PbSe nanostructures. The energy gap increases as the inverse of the size both for wells and dots. For PbSe nanocrystals, the luminescence lifetime, the confinement energy and the intraband optical properties are in good agreement with experiments. The high quantum yield observed experimentally can be explained by the absence of surface dangling bonds in these systems. The full frequency-dependent dielectric function ɛ(ω) is calculated for PbSe quantum wells. Its imaginary part is strongly anisotropic and shows large variations with respect to its bulk value even far from the gap region.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Non spécifiée
Vulgarisation :
Non
Source :
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