Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 68: Graphene: Preparation and Characterization I (jointly with HL, MA and TT)
O 68.8: Talk
Thursday, March 14, 2013, 12:15–12:30, H17
Phonons of graphene on Ir(111) — •Michael Endlich1, Alejandro Molina-Sánchez2, Ludger Wirtz2, and Jörg Kröger1 — 1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau — 2Physics and Material Sciences Research Unit, University of Luxembourg, L-1511 Luxembourg
The phonon dispersion relations of graphene on Ir(111) were determined with angle-resolved inelastic electron scattering. A weak graphene–Ir interaction is inferred from the lifting of the degeneracy of the out-of-plane optical and acoustic dispersion branches at the K point of the surface Brillouin zone and from the energy reduction of the out-of-plane optical phonon. Despite this interaction the Kohn anomalies known from graphite of the highest optical phonon branch at Γ and K persist. The experimental dispersion relations are in agreement with density functional calculations.