2013/10/29 by M. Endlich, Alejandro Molina‐Sánchez, A. Molina-Sánchez +3 · 44 citations
Materials Science · Physics and Astronomy · #Brillouin zone #Condensed matter physics #Coupling (piping) #Dispersion (optics) #Electron #Graphene #Graphene research and applications #Graphite #Materials science #Nanotechnology #Phonon #Physics #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Surface and Thin Film Phenomena #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.88.205403
published in Physical Review B 88(20) (American Physical Society)
arxiv created 2013/10/29 · openalex publication_date 2013/11/04 · arxiv updated 2015/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 \ensuremathΓ 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.