Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 30: Electronic structure of Surfaces: Magnetism and Spin Phenomena
MA 30.8: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1A
Spin-resolved electron transmission through self-assembled layers of PNA — •Paul Möllers1, Matthias Kettner1, Daniel Nürenberg1, Francesco Tassinari2, Tal Z. Markus2, Catalina Achim3, Ron Naaman2, and Helmut Zacharias1 — 1Physikalisches Institut, Universität Münster, Germany — 2Department of Chemical Physics, Weizmann Institute, Rehovot, Israel — 3Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States
The yield of electrons transmitted through chiral molecules can depend on the electron’s spin; chiral molecules can therefore act a spin filters. This effect is referred to as the chirality-induced spin selectivity (CISS). Previous experiments have e.g. been performed with monolayers of double-stranded DNA [1]. In this contribution, we present results of our spin-resolved photoemission experiments performed at room temperature. The samples consist of self-assembled monolayers of helical molecules – various types of double-stranded peptide nucleic acid (PNA) – on polycrystalline gold surfaces. The samples are irradiated by a laser at λ=213 nm to generate photoelectrons from the gold substrate which are then transmitted through the adsorbed monolayer. Subsequently, the electrons are analyzed by a Mott polarimeter. We found longitudinal spin polarizations of −5 % for PNA and +4 % for γ-PNA. The results indicate that the adsorbed molecules act as a spin filter.
[1] B. Göhler et al., Science 331, 894 (2011)