Excitonic and quasiparticle gaps in Si nanocrystals

Delerue, Christophe; Lannoo, Michel; Allan, Guy

Document type :

Communication dans un congrès avec actes

DOI :

10.1103/PhysRevLett.84.2457

Title :

Excitonic and quasiparticle gaps in Si nanocrystals

Author(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]

Conference title :

CECAM Workshop on Excited States and Electronic Spectra

City :

Lyon

Country :

France

Start date of the conference :

2000

Publication date :

2000

HAL domain(s) :

Sciences de l'ingénieur [physics]

English abstract : [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. ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Non spécifiée

Popular science :

Non

Collections :

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

Source :

Harvested from HAL

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