Title :

Anisotropic excitonic effects in the energy loss function of hexagonal boron nitride

Author(s) :

Galambosi, S. [Auteur]
Helsingin yliopisto = Helsingfors universitet = University of Helsinki
Wirtz, L. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Soininen, J.A. [Auteur]
Helsingin yliopisto = Helsingfors universitet = University of Helsinki
Serrano, J. [Auteur]
Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
Marini, A. [Auteur]
Ikerbasque - Basque Foundation for Science
Dipartimento di Fisica [Roma Tor Vergata]
Universidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]
Centro de Fisica de Materiales [CFM]
Watanabe, K. [Auteur]
National Institute for Materials Science [NIMS]
Taniguchi, T. [Auteur]
National Institute for Materials Science [NIMS]
Huotari, S. [Auteur]
European Synchrotron Radiation Facility [Grenoble] [ESRF]
Helsingin yliopisto = Helsingfors universitet = University of Helsinki
Rubio, A. [Auteur]
Centro de Fisica de Materiales [CFM]
Hamalainen, K. [Auteur]
Helsingin yliopisto = Helsingfors universitet = University of Helsinki

Journal title :

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

Pages :

081413

Publisher :

American Physical Society

Publication date :

2011

ISSN :

1098-0121

HAL domain(s) :

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

English abstract : [en]

The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with momentum transfer ...
Show more >The anisotropy of the valence energy-loss function of hexagonal boron nitride (hBN) is shown to be largely enhanced by the highly inhomogeneous character of the excitonic states. The energy loss with momentum transfer parallel to the BN layers is dominated by strongly bound, quasi-two-dimensional excitons. In contrast, excitations with momentum transfer perpendicular to the layers are influenced by weakly bound three-dimensional excitons. This striking phenomenon is revealed by a combined study using high-precision nonresonant inelastic x-ray scattering measurements supported by ab initio calculations. The results are relevant in general to layered insulating systems.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

/

Collections :

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

Source :

Harvested from HAL