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Graphene on Ru(0001): a corrugated and chiral structure


Martoccia, D; Björck, M; Schlepütz, C M; Brugger, T; Pauli, S A; Patterson, B D; Greber, T; Willmott, P R (2010). Graphene on Ru(0001): a corrugated and chiral structure. New Journal of Physics, 12(4):043028.

Abstract

We present a structural analysis of the graphene/Ru(0001) system obtained by surface x-ray diffraction. The data were fitted using Fourier-series-expanded displacement fields from an ideal bulk structure plus the application of symmetry constraints. The shape of the observed superstructure rods proves a reconstruction of the substrate, induced by strong bonding of graphene to ruthenium. Both the graphene layer and the underlying substrate are corrugated, with peak-to-peak heights of (0.82±0.15) Å and (0.19±0.02) Å for graphene and the topmost Ru-atomic layer, respectively. The Ru corrugation decays slowly over several monolayers into the bulk. The system also exhibits chirality, whereby in-plane rotations of up to 2.0° in those regions of the superstructure where the graphene is weakly bound are driven by elastic energy minimization.

Abstract

We present a structural analysis of the graphene/Ru(0001) system obtained by surface x-ray diffraction. The data were fitted using Fourier-series-expanded displacement fields from an ideal bulk structure plus the application of symmetry constraints. The shape of the observed superstructure rods proves a reconstruction of the substrate, induced by strong bonding of graphene to ruthenium. Both the graphene layer and the underlying substrate are corrugated, with peak-to-peak heights of (0.82±0.15) Å and (0.19±0.02) Å for graphene and the topmost Ru-atomic layer, respectively. The Ru corrugation decays slowly over several monolayers into the bulk. The system also exhibits chirality, whereby in-plane rotations of up to 2.0° in those regions of the superstructure where the graphene is weakly bound are driven by elastic energy minimization.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2010
Deposited On:16 Feb 2011 15:57
Last Modified:05 Apr 2016 14:46
Publisher:Institute of Physics Publishing
ISSN:1367-2630
Publisher DOI:https://doi.org/10.1088/1367-2630/12/4/043028
Related URLs:http://arxiv.org/abs/0908.4517

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