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O: Fachverband Oberflächenphysik

O 67: Electronic structure of surfaces: Spectroscopy, surface states III

O 67.4: Vortrag

Mittwoch, 14. März 2018, 16:00–16:15, MA 042

Optical anisotropy of SrTiO₃(110) for different surface terminations — •Karsten Fleischer, Brian Walls, Kuanysh Zhussupbekov, and Igor V. Shvets — School of Physics, Trinity College Dublin, The University of Dublin, Dublin 2, Ireland

In this work we investigate the SrTiO₃(110) surface by reflectance anisotropy spectroscopy (RAS) at varying preparation steps including ex-situ wet etching, high temperature oxygen annealing, as well as in-situ vacuum annealing. Different surface terminations show distinctly different RAS spectra which are correlated to an altered surface stoichiometry measured by X-ray photoelectron spectroscopy (XPS) and an altered valence band structure measured by UV-photoelectron spectroscopy (UPS) in cases of conductive samples. We link the changes in the observed RAS spectra to various surface reconstructions, with particular focus of the signature of (3×1) and (1×4) reconstructed surfaces, and a metallic surface state observed in vacuum annealed SrTiO₃.