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

Grueneis, A.; Serrano, J.; Bosak, A.; Lazzeri, M.; Molodtsov, S. L.; Wirtz, Ludger; Attaccalite, C.; Krisch, M.; Rubio, A.; Mauri, F.; Pichler, T.

doi:10.1103/PhysRevB.80.085423

Reference : Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/8263

Title :	Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions
Language :	English
Author, co-author :	Grueneis, A. [Faculty of Physics, University of Vienna / IFW–Dresden]
	Serrano, J. [CREA–Departamento de Fisica Aplicada, Universitat Politecnica de Catalunya]
	Bosak, A. [European Synchrotron Radiation Facility]
	Lazzeri, M. [IMPMC, IPGP, Universités Paris 6 et 7, CNRS]
	Molodtsov, S. L. [Institut für Festkörperphysik, TU Dresden]
	Wirtz, Ludger [Institute for Electronics, Microelectronics, and Nanotechnology (CNRS UMR 8520), Dept. ISEN]
	Attaccalite, C. [Nano-Bio Spectroscopy Group and ETSF Scientific Development Centre, Dpto. Física de Materiales, Universidad del País Vasco, Centro de Física de Materiales CSIC-UPV/EHU-MPC and DIPC]
	Krisch, M. [European Synchrotron Radiation Facility]
	Rubio, A. [Nano-Bio Spectroscopy Group and ETSF Scientific Development Centre, Dpto. Física de Materiales, Universidad del País Vasco, Centro de Física de Materiales CSIC-UPV/EHU-MPC and DIPC / Fritz-Haber-Institute of the Max Planck Society, Theory Department]
	Mauri, F. [MPMC, IPGP, Universités Paris 6 et 7, CNRS]
	Pichler, T. [Faculty of Physics, University of Vienna]
Publication date :	2009
Journal title :	Physical Review. B
Volume :	80
Issue/season :	8
Peer reviewed :	Yes (verified by ORBi^lu)
Audience :	International
ISSN :	1098-0121
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 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 degrees)(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.
Permalink :	http://hdl.handle.net/10993/8263
DOI :	10.1103/PhysRevB.80.085423

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