Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Graphene: Structural properties
O 19.3: Vortrag
Montag, 31. März 2014, 16:30–16:45, WIL C107
Moiré-induced Brillouin zone backfolding of graphene phonons on Ir(111) — •Michael Endlich1, Alejandro Molina-Sánchez2, Henrique Miranda2, 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 moiré superstructure of graphene on Ir(111) leaves its characteristic footsteps in the phonon dispersion. Replica of the phonon dispersion branches of singly oriented graphene on Ir(111) have been determined throughout the entire surface Brillouin zone with angle-resolved inelastic electron scattering. These replica are rationalized in terms of phonon backfolding induced by the graphene moiré superlattice.