Title :

Phonon surface mapping of graphite : disentangling quasi-degenerate phonon dispersions

Author(s) :

Gruneis, A. [Auteur]
Serrano, J. [Auteur]
Bosak, A. [Auteur]
Lazzeri, M. [Auteur]
Molodtsov, S.L. [Auteur]
Wirtz, L. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Attaccalite, Claudio [Auteur]
Krisch, M. [Auteur]
Rubio, A. [Auteur]
Mauri, Francesco [Auteur]
Pichler, T. [Auteur]

Journal title :

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

Pages :

085423-1-5

Publisher :

American Physical Society

Publication date :

2009

ISSN :

1098-0121

HAL domain(s) :

Sciences de l'ingénieur [physics]

English abstract : [en]

The two-dimensional mapping of the phonon dispersions around the K point of graphite by inelastic x-ray scattering is provided. The present work resolves the longstanding issue related to the correct assignment of transverse ...
Show more >The two-dimensional mapping of the phonon dispersions around the K point of graphite by inelastic x-ray scattering is provided. The present work resolves the longstanding issue related to the correct assignment of transverse and longitudinal phonon branches at K. We observe an almost degeneracy of the three TO, LA and LO derived phonon branches and a strong phonon trigonal warping. Correlation effects renormalize the Kohn anomaly of the TO mode, which exhibits a trigonal warping effect opposite to that of the electronic band structure. We determined the electron–phonon coupling constant to be 166(eV/˚A)2 in excellent agreement to GW calculations. These results are fundamental for understanding angle-resolved photoemission, double–resonance Raman and transport measurements of graphene based systems.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