Coupling of excitons and defect states in boron-nitride nanostructures

Attaccalite, Claudio; Bockstedte, M.; Marini, A.; Rubio, A.; Wirtz, L.

Type de document :

Compte-rendu et recension critique d'ouvrage

DOI :

10.1103/PhysRevB.83.144115

Titre :

Coupling of excitons and defect states in boron-nitride nanostructures

Auteur(s) :

Attaccalite, Claudio [Auteur]
Théorie de la Matière Condensée [NEEL - TMC]
Bockstedte, M. [Auteur]
Marini, A. [Auteur]
Rubio, A. [Auteur]
Wirtz, L. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Titre de la revue :

Physical Review B: Condensed Matter and Materials Physics (1998-2015)

Pagination :

144115

Éditeur :

American Physical Society

Date de publication :

2011-04-29

ISSN :

1098-0121

Discipline(s) HAL :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

Résumé en anglais : [en]

The signature of defects in the optical spectra of hexagonal boron nitride (BN) is investigated using many body perturbation theory. A single BN-sheet serves as a model for different layered BN- nanostructures and crystals. ...
Lire la suite >The signature of defects in the optical spectra of hexagonal boron nitride (BN) is investigated using many body perturbation theory. A single BN-sheet serves as a model for different layered BN- nanostructures and crystals. In the sheet we embed prototypical defects such as a substitutional impurity, isolated Boron and Nitrogen vacancies, and the di-vacancy. Transitions between the deep defect levels and extended states produce characteristic excitation bands that should be responsible for the emission band around 4 eV, observed in luminescence experiments. In addition, defect bound excitons occur that are consistently treated in our ab initio approach along with the "free" exciton. For defects in strong concentration, the co-existence of both bound and free excitons adds sub-structure to the main exciton peak and provides an explanation for the corresponding feature in cathodo and photo-luminescence spectra.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Commentaire :

in press on Phys. Rev. B

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