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O: Fachverband Oberflächenphysik

O 55: Graphene

O 55.1: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-EG

Inelastic electron tunnelling into graphene bilayers on Ir(111) — •Alexander Tries, Johannes Halle, Nicolas Néel, and Jörg Kröger — Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany

Physical vapour deposition of C onto graphene-covered Ir(111) has been used to fabricate graphene nanoflakes. Due to C atom intercalation the flakes form underneath graphene. Scanning tunnelling microscopy with atomic resolution reveals that the lattices of the upper graphene layer and the flakes are rotated with respect to each other. Spectra of the differential conductance show the hole-like Ir(111) surface resonance on top of the graphene-flake stackings. Graphene phonons with wave vectors comparable to the Brillouin zone dimensions leave their signatures in inelastic electron tunnelling spectra. Funding by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/10-1 is acknowledged.