Non-conventional bell-shaped diffuse scattering in low-energy electron diffraction from high-quality epitaxial 2D-materials

Date
2021-06-16
Authors
Omambac, K.
Kriegel, M.
Brand, C.
Finke, B.
Kremeyer, L.
Hattab, H.
Janoschka, D.
Dreher, P.
Meyer zu Heringdorf, F.-J.
Pakdehi, D. Momeni
Pierz, K.
Schumacher, H. W.
Petrović, M.
van Houselt, A.
Poelsema, B.
Tringides, Michael
Horn-von Hoegen, M.
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Ames Laboratory
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Physics and Astronomy
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Ames LaboratoryPhysics and Astronomy
Abstract

A broad, bell-shaped intensity component is observed in low-energy electron diffraction from high-quality epitaxial 2D-systems. Three 2Dsystems, graphene on Ir(111), graphene on SiC(0001), and hexagonal boron nitride on Ir(111), have been prepared in situ under ultra-high vacuum conditions. In all three systems—independent of substrate material—similar strong diffuse intensity is observed, exhibiting a width as large as 50% of the Brillouin zone and an integrated intensity more than 10 times the intensity of the Bragg spots. The presented experimental results provide evidence for a common origin of such diffuse diffraction intensity in different atomically thin 2D-materials.

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