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Título

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

Autor Grüneis, Alexander; Lazzeri, Michele; Wirtz, Ludger; Attaccalite, Claudio; Rubio, Angel; Mauri, Francesco; Pichler, Thomas
Fecha de publicación 2009
EditorAmerican Physical Society
Citación Physical Review B 80: 085423 (2009)
ResumenThe 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.
Descripción PACS number s : 71.38. k, 71.10. w, 79.60. i.-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.80.085423
URI http://hdl.handle.net/10261/95913
DOI10.1103/PhysRevB.80.085423
ISSN1098-0121
E-ISSN1550-235X
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