SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Poster Session II: Nanostructures at surfaces II
O 26.1: Poster
Montag, 1. März 2021, 13:30–15:30, P
Single-crystal graphene on Ir(110): a uniaxial template — •Stefan Kraus1, Felix Huttmann1, Timo Knispel1, Jeison Fischer1, Ken Bischof1, Alexander Herman2, Marco Bianchi3, Raluca-Maria Stan3, Ann Julie Holt3, Vasile Caciuc4, Shigeru Tsukamoto4, Heiko Wende2, Philip Hofmann3, Nicolae Atodiresei4, and Thomas Michely1 — 1Universität zu Köln, Germany — 2Universität Duisburg-Essen, Germany — 3Aarhus university, Denmark — 4Forschungszentrum Jülich, Germany
A single-crystal sheet of graphene is grown on the low-symmetry substrate Ir(110) by thermal decomposition of ethylene at 1500 K. While the bare Ir(110) is heavily reconstructed at room temperature due to the formation of nano-facets, scanning tunneling microscopy reveals that the adsorbed graphene suppresses this reconstruction entirely and large atomically flat areas are observed. The superposition of the graphene with the Ir(110) lattice gives rise to a wave pattern with clear crests and troughs along the [001] direction while the atomic lattice of the graphene is under very weak lateral strain (<0.2% compared to graphite). Density functional theory calculations confirm the observed wave pattern and show a strong variation from weak (crests) to strong chemical binding (troughs). Angle-resolved photo emission spectroscopy shows no sign of a Dirac cone, which is in agreement with the large variety of binding motifs and partial sp3 hybridization. We showcase the use of this uniaxial template by the global alignment of sandwich-molecular wires — one-dimensional organo-metallic structures — parallel to the crests and troughs.