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O: Fachverband Oberflächenphysik

O 18: Poster Monday: 2D Materials 1

O 18.10: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Bell-shaped Electron Diffraction Component in 2D Materials — •Hannah Kohler, Frank Meyer zu Heringdorf, and Michael Horn-von Hoegen — Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany

In low energy electron diffraction a bell shaped component (BSC) is observed for graphene on SiC and Ir(111) and for hBN on Ir(111) [APL118 (2021) 241902]. The distinctiveness of this broad diffuse intensity appears to be indicative of a highly ordered 2D layer. Several attempts were made to explain the origin of the BSC, but the mechanism remains at large still unclear. In particular, a classification in which 2D systems a BSC exists is missing. Low energy electron microscopy (LEEM) combines the possibility to investigate the BSC with micro-diffraction (µ-LEED) and in-situ imaging. It was found that the BSC can in fact be detected not only on graphene and hBN, but also on ex-situ chemical-vapor-deposition-grown MoS2. In graphene on Ir(111) the full width at half maximum (FWHM) of the BSC decreases with an increase in rotational angle of the graphene. Measurements after Cs intercalation of the graphene show a smaller FWHM compared to the non-intercalated graphene layer.