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29 March 2024
 
  » arxiv » 1908.3506

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A diffraction paradox: An unusually broad diffraction background signals ideal graphene
S. Chen ; M. Horn von Hoegen ; P. A. Thiel ; M.C.Tringides ;
Date 9 Aug 2019
AbstractThe realization of the unusual properties of 2-d materials requires the formation of large domains of single layer thickness, extending over the mesoscale. It is found that the formation of ideal graphene on SiC, contrary to textbook diffraction , is signaled by a strong bell-shaped-component (BSC) around the (00) and G(10), but not the SiC(10) spots.The BSC is also seen for graphene on metals, because single layer uniform graphene with large lateral size can also be grown.It is only seen by electron diffraction and not with X-ray or He-scattering experiments. Most likely it originates from the spatial confinement of the graphene electrons within a single layer.This leads to a large spread in their wavevector, which is transferred through electron-electron interactions to the elastically scattered electrons to generate the BSC.
Source arXiv, 1908.3506
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