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dc.contributor.authorGrüneis, Alexander-
dc.contributor.authorLazzeri, Michele-
dc.contributor.authorWirtz, Ludger-
dc.contributor.authorAttaccalite, Claudio-
dc.contributor.authorRubio, Angel-
dc.contributor.authorMauri, Francesco-
dc.contributor.authorPichler, Thomas-
dc.identifier.citationPhysical Review B 80: 085423 (2009)es_ES
dc.descriptionPACS number s : 71.38. k, 71.10. w, 79.60. i.-- et al.es_ES
dc.description.abstractThe 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.es_ES
dc.description.sponsorshipA.G. acknowledges an APART grant from the Austrian Academy of Sciences and a Marie Curie Reintegration grant ECO-GRAPHENE from the EU. J.S. acknowledges support from Spanish MICINN Grants No. MAT2007-60087 and No. ENE2008-04373 and Generalitat de Catalunya Grant No. 2005SGR00535 . A.R. and L.W. are funded by Spanish MEC Grant No. FIS2007-65702-C02-01 , “Grupos Consolidados UPV/EHU and DIPC del Gobierno Vasco” IT- 319-07 and EC-I3 ETSF project Contract No. 211956 .es_ES
dc.publisherAmerican Physical Societyes_ES
dc.relation.isversionofPublisher's versiones_ES
dc.titlePhonon surface mapping of graphite: Disentangling quasi-degenerate phonon dispersionses_ES
dc.description.peerreviewedPeer reviewedes_ES
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