Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Organic molecules on inorganic substrates: electronic, optical and other properties I
O 9.1: Vortrag
Montag, 9. März 2026, 15:00–15:15, HSZ/0201
Adsorption-induced chirality of an otherwise highly-symmetrical molecule — •Jannis Leßmeister1, Chetana Badala Viswanatha1, Andreas Windischbacher2, Christian S. Kern2, Lu Lyu3, Vitaliy Feyer4, Iulia Cojocariu4, Daniel Baranowski4, Martin Aeschlimann1, Peter Puschnig2, and Benjamin Stadtmüller3 — 1Department of Physics and Research Center OPTIMAS, RPTU University Kaiserslautern-Landau, 67633 Kaiserslautern, Germany — 2Institute of Physics, University of Graz, 8010 Graz, Austria — 3Institute of Physics, University of Augsburg, 86159 Augsburg, Germany — 4Peter Grünberg Institute (PGI-6), Jülich Research Centre, 52428 Jülich, Germany
Chirality is a fundamental concept with far-reaching implications across chemistry, biology and materials science. In condensed matter, interest has grown around the chiral-induced spin selectivity (CISS) effect, which promises spin-dependent functionality in chiral molecules without magnetic or heavy-metal components. So far, however, the role of the interface for CISS remains unclear.
To illuminate the interactions at chiral metal-molecular interfaces, we explore how the highly-symmetrical molecule pentacene adsorbes on a naturally chiral copper surface. Employing momentum microscopy we identify changes of the emission pattern of the frontier molecular orbitals of pentacene adsorbed on chiral Cu(643) versus achiral Cu(110). In conjunction with density functional theory calculations, we can attribute these observations to a twisting of pentacene and thus to an adsorption-induced chirality of the otherwise symmetric molecule.
Keywords: chirality; organic molecules; inorganic substrates; momentum microscopy; density functional theory