[en] The phonon dispersion of graphene on Ir(111) has been determined by means of angle-resolved inelastic electron scattering and density functional calculations. Kohn anomalies of the highest optical-phonon branches are observed at the ¯ and ¯K point of the surface Brillouin zone. At ¯K the Kohn anomaly is weaker than observed for pristine graphene and graphite. This observation is rationalized in terms of a decrease of the electron-phonon coupling due to screening of graphene electron correlations by the metal substrate.
Disciplines :
Physique
Auteur, co-auteur :
Endlich, M.; Technische Universität Illmenau, Germany
MOLINA-SANCHEZ, Alejandro ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
WIRTZ, Ludger ; urg, Physics and Material Sciences Research Unit / CNRS UMR 8520, IEMN, France
Kröger, J.
Langue du document :
Anglais
Titre :
Screening of electron-phonon coupling in graphene on Ir(111)
Date de publication/diffusion :
04 novembre 2013
Titre du périodique :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Maison d'édition :
American Physical Society, Woodbury, Etats-Unis - New York
