Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 98: Electronic structure: Surface magnetism and spin phenomena I
O 98.6: Vortrag
Donnerstag, 15. März 2018, 16:15–16:30, MA 042
Spin-resolved electron transmission through self-assembled layers of PNA — •Paul Möllers1, Daniel Nürenberg1, Matthias Kettner1, Francesco Tassinari2, Tal Markus2, Selma Ulku3, 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, 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) effect. 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 −6 % for PNA and +25 % for γ-PNA. The results indicate that the adsorbed molecules act as a spin filter.
[1] B. Göhler et al., Science 331, 894 (2011)