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TT: Fachverband Tiefe Temperaturen

TT 32: Focus Session: Spin Phenomena in Chiral Molecular Systems I (joint session O/TT)

TT 32.6: Talk

Tuesday, March 19, 2024, 12:30–12:45, MA 141

Chiral-induced spin selective transmission (CISS) on naturally chiral surfaces — •Chetana Badala Viswanatha1, Johannes Stöckl1, Benito Arnoldi1, Sebastian Becker1, Ka Man Yu1, Martin Mitkov1, Iulia Cojocariu2, Vitaliy Feyer2, Martin Aeschlimann1, and Benjamin Stadtmüller11Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany

The chiral-induced spin selectivity (CISS) effect refers to the spin-selective electron transmission via chiral molecules. So far, CISS has been studied for helical molecules on noble metal surfaces. Here, we focus on CISS in molecules grown on a chiral Cu surface. Using spin- and momentum-resolved photoelectron spectroscopy, we show that the spin-dependent electron transmission through a point-chiral molecule on the chiral Cu(643) surface depends on all three components of the electron's spin [1]. Swapping the enantiomers alters the electrons' spin component parallel to the terraces of the chiral surface. This emphasizes the role of enantiomer-specific adsorption configurations on chiral surfaces. To understand the role of substrate chirality in CISS, we focus on the effect of a surface's chirality on the electronic properties of the adsorbed molecules. We use the highly symmetric pentacene on the Cu(643) surface as an example. Our momentum-resolved photoemission data show adsorption-induced changes in the orbital emission pattern that can be attributed to the chiral nature of the Cu surface. [1] J. Phys. Chem. Lett. 2022, 13, 26, 6244-6249.

Keywords: CISS effect; Chiral Surfaces; Chiral Molecules; Induced Chirality; Photoelectron Spectroscopy

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