SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Organic Molecules on Inorganic Substrates I: Electronic, Optical and Other Properties I
O 2.8: Vortrag
Montag, 27. März 2023, 12:15–12:30, CHE 89
Enantiospecific adsorption on a ferromagnetic surface at the single-molecule scale — •M.R. Safari1, F. Matthes1, K-H. Ernst2, D.E. Bürgler1, and C.M. Schneider1 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich,52425 Jülich, Germany — 2Molecular Surface Science Group, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600, Dübendorf, Switzerland
The recently discovered effect of chirality-induced spin selectivity (CISS) not only enables spin-selective electron transport in organic molecules [1], but also offers a novel approach to chiral separation by exploiting the CISS-induced enantiospecific interaction of chiral molecules with perpendicularly magnetized substrates [2]. Using low-temperature spin-polarized scanning tunneling microscopy, we have investigated the enantiospecific adsorption of heptahelicene molecules on ferromagnetic Co bilayer islands [3,4]. High-resolution and spin-polarized STM images enable direct determination of the enantiomeric adsorption ratio R on oppositely magnetized Co islands. Statistical analysis of 748 molecules on 110 islands yields R = 0.69 ± 0.05, which we attribute to different enantiospecific adsorption energies. The well-defined structural, electronic, and magnetic properties of the molecule-substrate systems make our results readily amenable to theoretical modeling that will hopefully shed light on the microscopic origin of enantiospecific adsorption on ferromagnetic surfaces. [1] R. Naaman et al., J. Phys. Chem. Lett. 3, 2178 (2012); [2] K. Banerjee-Ghosh et al., Science 360, 1331 (2018); [3] M.R. Safari et al., Nanomaterials 12, 3281 (2022); [4] M.R. Safari et al., arXiv:2211.12976 (2022)