Dresden 2026 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 61: Organic molecules on inorganic substrates: electronic, optical and other properties II
O 61.8: Vortrag
Mittwoch, 11. März 2026, 16:45–17:00, HSZ/0201
Vectorial spin-to-charge conversion by supramolecular chirality — •Sophie Knewitz1, Guillaume Schweicher2, Ashish Moharana1, Yves Geerts2, and Angela Wittmann1 — 1Johannes Gutenberg-Universität, Mainz, Germany — 2Université Libre, Bruxelles, Belgium
The chiral-induced spin selectivity (CISS) effect describes how electrons get spin-polarized due to the presence of chiral molecules. The high polarization efficiency makes it promising for future sustainable hybrid chiral molecule magnetic applications. While there are many experimental reports of different aspects of the CISS effect, a complete understanding of the fundamental mechanisms remains an open challenge. In this work, we investigate the role of supramolecular chirality and atomic spin-orbit coupling on the CISS effect in hybrid metal thin film / chiral organic crystal heterostructures. Using spin pumping to inject a pure spin current in the metal thin film, we probe the spin-to-charge conversion at the chiral interface. Based on our recent finding that CISS is a vectorial effect [1], we use a molecular chiral crystal to probe the CISS effect in a well-ordered system in order to maximize the polarization efficiency. Our angle-dependent measurements confirm that the spin selectivity of the chiral supramolecular crystal is highly sensitive to its orientation relative to the spin direction in the metal thin film under the applied magnetic field. These results open new ways for the vectorial manipulation of hybrid spintronic devices by chirality.
[1]: Moharana, A. et al., Sci. Adv. 11, eado4285 (2025).
Keywords: Chiral-induced spin selectivity; Spin pumping