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Title: Determination of the geometric corrugation of graphene on SiC(0001) by grazing incidence fast atom diffraction

We present a grazing incidence fast atom diffraction (GIFAD) study of monolayer graphene on 6H-SiC(0001). This system shows a Moiré-like 13 × 13 superlattice above the reconstructed carbon buffer layer. The averaging property of GIFAD results in electronic and geometric corrugations that are well decoupled; the graphene honeycomb corrugation is only observed with the incident beam parallel to the zigzag direction while the geometric corrugation arising from the superlattice is revealed along the armchair direction. Full-quantum calculations of the diffraction patterns show the very high GIFAD sensitivity to the amplitude of the surface corrugation. The best agreement between the calculated and measured diffraction intensities yields a corrugation height of 0.27 ± 0.03 Å.
Authors:
; ; ; ; ; ; ;  [1] ;  [1] ;  [2]
  1. Institut des Sciences Moléculaires d'Orsay, ISMO, UMR 8214, CNRS-Univ Paris-Sud, Bât. 351, F-91405 Orsay (France)
  2. (France)
Publication Date:
OSTI Identifier:
22395699
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMS; CRYSTAL STRUCTURE; DIFFRACTION; GRAPHENE; LAYERS; SENSITIVITY; SILICON CARBIDES; SUPERLATTICES; SURFACES