Excitonic and quasiparticle gaps in Si nanocrystals

Delerue, Christophe; Lannoo, Michel; Allan, Guy

Type de document :

Communication dans un congrès avec actes

DOI :

10.1103/PhysRevLett.84.2457

Titre :

Excitonic and quasiparticle gaps in Si nanocrystals

Auteur(s) :

Delerue, Christophe [Auteur]

Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Lannoo, Michel [Auteur]
Allan, Guy [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Titre de la manifestation scientifique :

CECAM Workshop on Excited States and Electronic Spectra

Ville :

Lyon

Pays :

France

Date de début de la manifestation scientifique :

2000

Date de publication :

2000

Discipline(s) HAL :

Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

We present calculations of the one- and two-particle excitations in silicon nanocrystals. The one-particle properties are handled in the GW approximation, and the excitonic gap is obtained from the Bethe-Salpeter equation. ...
Lire la suite >We present calculations of the one- and two-particle excitations in silicon nanocrystals. The one-particle properties are handled in the GW approximation, and the excitonic gap is obtained from the Bethe-Salpeter equation. We develop a tight binding version of these methods to treat clusters up to 275 atoms. The self-energy and Coulomb corrections almost exactly cancel each other for crystallites with radius larger than 0.6 nm. The result of this cancellation is that one-particle calculations give quite accurate values for the excitonic gap of crystallites in the most studied range of sizes.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Non spécifiée

Vulgarisation :

Non

Collections :

Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL

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