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

被引：75

作者：

Martoccia, D. ^{[1
]}

Bjoerck, M. ^{[1
]}

Schlepuetz, C. M. ^{[1
]}

Brugger, T. ^{[2
]}

Pauli, S. A. ^{[1
]}

Patterson, B. D. ^{[1
]}

Greber, T. ^{[2
]}

Willmott, P. R. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

来源：

NEW JOURNAL OF PHYSICS | 2010年 / 12卷

关键词：

AB-INITIO CALCULATIONS; EPITAXIAL GRAPHENE; SURFACE; RELAXATION; ENERGY; DIFFRACTION; STRAIN;

D O I：

10.1088/1367-2630/12/4/043028

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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)angstrom and (0.19 +/- 0.02)angstrom 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 degrees in those regions of the superstructure where the graphene is weakly bound are driven by elastic energy minimization.

引用

页数：12

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