Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 46: Organic molecules on inorganic substrates: electronic, optical and other properties – Poster
O 46.1: Poster
Dienstag, 10. März 2026, 14:00–16:00, P2
Investigation of chiral helicene molecules on the superconducting substrate Pb(111) — •Melvin Grumser1, Rahel Specht1, Vincent Herzog1, Wenhui Niu2, Narcis Avarvari3, and Katharina J. Franke1 — 1Freie Universität Berlin, Berlin, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany — 3University of Angers, Angers, France
Chiral molecules have recently garnered a lot of attention for their ability to partially spin polarize currents running through them, which is of interest for the emerging field of spintronics. Chirality induced spin selectivity (CISS) typically manifests itself in experiments in which a current passes through a chiral molecule, as has been done down to the single-molecule scale using scanning tunneling microscopy [1]. However, recent studies suggest that the adsorption of chiral molecules might already lead to magnetization in the surface layer which could locally interact with the Cooper-pairs of a superconducting substrate [2]. Here, we investigate the effect of adsorbed chiral molecules on the elemental superconductor Lead. For this, [7]-Helicene and [6]-Helicene derivatives were evaporated onto a Pb(111) surface and investigated via STM and AFM. The molecules form ordered islands with different orientations of the molecules. In addition, we use scanning tunneling spectroscopy and identified the energy of the HOMO and LUMO. However, we do not observe any signatures of an alteration of the local superconducting behavior.
[1] Safari, Mohammad Reza, et al. Small 20.22 (2024): 2308233.
[2] Shapira, Tamar, et al. Phys. Rev. B 98.21 (2018): 214513.
Keywords: Scanning tunneling microscopy; Atomic force microscopy; CISS; Chiral molecules; Superconductivity