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HL: Fachverband Halbleiterphysik

HL 26: Graphene: Structural properties (organized by O)

HL 26.3: 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.