SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 107: Poster Session VIII: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces IV
O 107.6: Poster
Donnerstag, 4. März 2021, 13:30–15:30, P
Spin-polarized photoelectron emission from chiral cobalt oxide layers — •Onur Gül1, Paul Möllers1, Daniel Nürenberg1, Koyel Banerjee Ghosh2, Wenyan Zhang2, Francesco Tassinari2, Yitzhak Mastei2, Ortal Lidor-Shalev2, Simon Wei3, Emil Wierzbinski3, David Waldeck3, Ron Naaman2, and Helmut Zacharias1 — 1Center for Soft Nanoscience, Westfälische Wilhems-Universität, 48149 Münster, Germany — 2Department of Chemical and Biological Physics, Weizmann Institute of Science, 76100 Revohoz, Israel — 3Chemistry Department, University of Pittsburgh, Pittsburgh, PA 15260, United States
Chiral catalyst surfaces were recently shown to enhance the chemical selectivity of an electrocatalytic water splitting reaction by aligning the electron spins in the laboratory frame. [1] [2]
In this contribution we present results of spin-resolved photoemission experiments conducted with chiral cobalt oxide thin films. The photoelectrons were excited with laser pulses at λ=213 nm, generated as the fifth harmonic of a Nd:YVO4 laser, and the average spin polarization was determined in a Mott scattering apparatus. While only unpolarised electrons were emitted from the achiral layers, the electrons emitted from chiral layers exibit up to 30 percent spin polarization, suggesting that the spin polarization is indeed a consequence of the chirality of the layers.
[1] S. Ghosh et al,, J. Phys. Chem. C, 123 (2019) [2] K. B. Ghosh et al., J. Phys. Chem. C, 124 (2020)