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Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 25: Organic Molecules on Inorganic Substrates III: Adsorption & Growth

O 25.3: Vortrag

Dienstag, 19. März 2024, 11:00–11:15, MA 043

Constructing chiral overlayers: From single molecules to closed layers — •Jonas Brandhoff1, Fumi Nishino2,3, Keisuke Fukutani2,3, Marco Gruenewald1, Maximilian Schaal1, Felix Otto1, Roman Forker1, Satoshi Kera2,3, and Torsten Fritz11Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Institute for Molecular Science, Myodaiji, 444-8585, Okazaki, Japan — 3The Graduate University of Advanced Studies, Hayama-cho, 240-193 Kanagawa, Japan

Recently, the interest in chiral molecules has spiked. The chirality-induced spin selectivity (CISS) promises a high spin-polarizability for electrons traversing a chiral molecule. However, the CISS effect is yet not fully understood. To be able to probe the CISS effect with area averaging methods like photoelectron spectroscopy a well-defined chiral surface, consisting of chiral molecules, is needed. In this study the chiral molecule BINAP is investigated on a Au(111) surface. To understand how chirality from one single molecule evolves into a fully chiral overlayer, a coverage dependent study, showing many different structural motifs of BINAP, was done. This structural evolution was investigated using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED). In combination, these methods reveal a chiral lattice and the role of the different molecule-molecule and molecule-substrate interactions will be discussed. This study offers a deeper insight in the engineering of chiral surfaces and opens a possible pathway towards spintronic applications.

Keywords: Chirality; STM; LEED

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