Dresden 2026 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Organic molecules on inorganic substrates: Adsorption and growth III

O 58.8: Talk

Wednesday, March 11, 2026, 12:15–12:30, TRE/PHYS

In Situ Field-Induced Switching of Global Chirality in Halogen-Bonded Kagomé Networks — •Nico Kubetschek, Jana Dietrich, and René Matzdorf — Institute of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany

We used small organic molecules to construct a chiral Kagomé lattice on the Ag(111) and Au(111) surfaces. The chirality arises from triple halogen bonds that form windmill-like structures. Under certain conditions, we observe a switching in the rotational sense of whole terraces while scanning with STM. The total molecular coverage was used to tune the switching probability between the two chiral states. We demonstrate a bias-dependent attraction or repulsion of the molecules relative to the STM tip position, explaining the observed perturbation leading to the switching events.

Keywords: Scanning Tunneling Microscopy; Global Chirality; Molecular Selforganization; Kagomé Lattice; Halogen Bonds