Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 106: Electronic Structure of Surfaces: Spectroscopy, Surface States III
O 106.4: Talk
Friday, March 24, 2017, 11:15–11:30, WIL C107
Oxygen-2p valence band dispersion of two-dimensional oxide quasicrystal — •Cheng-Tien Chiang1,2, Martin Ellguth2,3, Florian O. Schumann1, Christian Tusche2,4, Stefan Förster1, Richard Kraska1, Jürgen Kirschner2,1, and Wolf Widdra1,2 — 1Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany — 3Institut für Physik, Johannes-Gutenberg-Universität Mainz, Mainz, Germany — 4Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Jülich, Germany
Valence bands of ultrathin BaTiO3-derived oxide quasicrystal (OQC) on Pt(111) [1] are investigated by angle-resolved photoelectron spectroscopy using the momentum microscope [2]. At around 4 and 6 eV below the Fermi level we observe valence states with flat dispersion as a function of the momentum parallel to the surface, whereas a strongly dispersive feature from 4.6 to 6 eV is discovered along the [110] direction. By comparison with the bulk BaTiO3 band structure we attribute these states to the O-2p valence bands of OQC and discuss their characteristic dispersion.
[1] S. Förster, K. Meinel, R. Hammer, M. Trautmann, and W. Widdra, Nature 502, 215 (2013) [2] C. Tusche, A. Krasyuk, and J. Kirschner, Ultramicroscopy 159, 520 (2015)