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          Institute: Fritz-Haber-Institut     Collection: Theory     Display Documents

ID: 446210.0, Fritz-Haber-Institut / Theory
Phonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersions
Authors:Grüneis, A.; Serrano, J.; Bosak, A.; Lazzeri, M.; Molodtsov, Sergeij L.; Wirtz, L.; Attaccalite, C.; Krisch, M.; Rubio, Angel; Mauri, F.; Pichler, T.
Date of Publication (YYYY-MM-DD):2009-08-19
Title of Journal:Physical Review B
Journal Abbrev.:Phys. Rev. B
Issue / Number:8
Start Page:085423-1
End Page:085423-5
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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/Å)2 in excellent agreement to GW calculations. These results are fundamental for understanding angle-resolved photoemission, doubleresonance Raman and transport measurements of graphene-based systems.
External Publication Status:published
Document Type:Article
Communicated by:Matthias Scheffler
External Affiliations:Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria

IFW–Dresden, P.O. Box 270116, D-01171 Dresden, Germany

ICREA–Departamento de Fisica Aplicada, Universitat Politecnica de Catalunya, EPSC, Av. Esteve Terradas 15,
08860 Castelldefels, Spain

European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France

IMPMC, IPGP, Universités Paris 6 et 7, CNRS, 140 rue de Lourmel, 75015 Paris, France

Institut für Festkörperphysik, TU Dresden, Mommsenstrasse 13, D-01069 Dresden, Germany

Institute for Electronics, Microelectronics, and Nanotechnology (CNRS UMR 8520), Dept. ISEN, B.P. 60069,
59652 Villeneuve d’Ascq Cedex, France

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, Av. Tolosa 72, E-20018 San Sebastián, Spain
Identifiers:URL:http://dx.doi.org/10.1103/PhysRevB.80.085423 [only subscriber]
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Grueneis-PRB-80-085423-2009.pdf  [460,00 Kb]   
0904.3205v1.pdf  [480,00 Kb] [Comment:arXiv:0904.3205v1 [cond-mat.str-el] 21 Apr 2009]  
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