Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 97: Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties II

O 97.5: Vortrag

Freitag, 21. März 2025, 11:30–11:45, H6

Probing the Roles of the Substrate Material, Spin Scattering, Temperature and Cooperative Effects in CISS — •Paul V. Möllers¹, Adrian J. Urban^2,3, Bianca C. Baciu⁴, Rafael Rodriguez⁵, Albert Guijarro⁴, Jeanne Crassous⁵, Steven De Feyter³, Hiroshi M. Yamamoto², and Helmut Zacharias¹ — ¹Center for Soft Nanoscience (SoN), University of Münster, Busso-Peus-Str. 10, 48149 Münster, Germany — ²Institute for Molecular Science, Research Center of Integrative Molecular Systems, Division of Functional Molecular Systems, 38 Nishigonaka, Myodaiji Okazaki, Aichi prefecture, 444-8585 Japan — ³Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200 F, 3001 Leuven, Belgium — ⁴Departamento de Química Orgánica, Instituto Universitario de Síntesis Orgánica, Unidad asociada al CSIC, Universidad de Alicante, E-03080, Alicante, Spain — ⁵University of Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR), UMR 6226, Rennes, France

Monolayers of heptahelicene ([7]H) and helical tetrapyrrole (TPBT) complexes were adsorbed onto different single-crystalline metal substrates, and the spin polarization of photoelectrons emitted from these surfaces was measured. The substrate material, the temperature and the surface coverage were systematically varied to investigate the roles of the substrate spin--orbit coupling, molecular vibrations, and intermolecular interactions in the generation of the spin polarization. Furthermore, thiolized (chemisorbed) [7]H and all-carbon (physisorbed) [7]H layers were compared.

Keywords: CISS; Chirality-Induced Spin Selectivity; Mott Scattering; Monolayer; Helicene