Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 97: Nanostructure at Surfaces: Structures and Properties
O 97.3: Vortrag
Freitag, 20. März 2015, 11:00–11:15, MA 005
Spin-resolved photoelectron spectroscopy of chiral nanostructures — •Daniel Nürenberg1, Andrew Mark2, Matthias Kettner1, Benjamin Göhler1, Peer Fischer2, and Helmut Zacharias1 — 1Westfälische Wilhelms-Universität, Münster, Germany — 2Max-Plank-Institut für Intelligente Systeme, Stuttgart, Germany
Helical molecules on surfaces have been shown to affect the spin polarization of photoelectrons excited from the substrate [1]. Further investigation demands new materials, showing similar effects, which offer more degrees of freedom in designing helical potentials than are possible with molecules. Helical nanostructures are a candidate for this. They can be grown on wafer scale size by glancing angle vapor deposition (GLAD) on a turning silicon wafer seeded with Au nanodots. The nanohelices have lengths of around 100 nm, a pitch of approximately 50 nm and show a circular dichroism at visible wavelengths [2]. We present spin- and polarization-resolved photoelectron studies of such nanostructures made of noble metal and noble metal alloys.
[1] Göhler, B.; Hamelbeck, V.; Markus, T.Z.; Kettner, M.; Hanne, G. F.; Vager, Z.; Naaman, R. and Zacharias, Science, 331, 894-897(2011)
[2] Mark, A.G.; Gibbs, J.G.; Lee, T. and Fischer, P., Nat. Mater.,12, 802-807(2013)