Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 32: Poster Tuesday: Adsorption and Catalysis 1

O 32.2: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Novel corrugated geometric moiré pattern of a semi-periodically buckled, zebra-like topography of Xe on Ag(110) — •Inga Christina Langguth and Karina Morgenstern — Chair of Physical Chemistry I, Ruhr-Universität Bochum, Bochum, Germany

Solid rare gas films on metal single crystals are currently gaining interest due to their beneficial properties. As non-ionic, low interacting insulator surfaces they offer a potential application for unperturbed surface science studies. STM investigations of a thin xenon (Xe) film of several monolayers on Ag(110) reveal a novel corrugated structure of a semi-periodically buckled, zebra-like topography. The outstanding feature of this surface is a non-uniform distribution of buckled row orientations and distances. Instead of domain boundaries separating different phases, a gradual transition of row orientations is observed. The corrugated row pattern can be attributed to a geometric moiré pattern at the interface of the incommensurable Ag(110) and Xe(111) crystal lattices. A gradual change of the row orientation can further be explained by a gradually changing Xe-lattice orientation with respect to Ag(110) within a narrow angle regime. The stability of this semi-periodic structure against annealing reveals a remarkably flat potential energy surface for the turning of the Xe layer relative to the Ag(110) surface. The corrugated surface may serve as an interesting substrate for further studies of geometric confinement effects in an anisotropic environment.