[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 :
Physics
Author, co-author :
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.
Language :
English
Title :
Screening of electron-phonon coupling in graphene on Ir(111)
Publication date :
04 November 2013
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York