Berlin 2024 – scientific programme

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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 Stadtmüller¹ — ¹Department 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