Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 55: Metal Oxide Surfaces III: Adsorption and Reactivity

O 55.4: Vortrag

Mittwoch, 3. April 2019, 15:45–16:00, H5

Adsorption of molecules on KTaO3 (001) and their coupling to the 2D electron gas — •Zhichang Wang, Igor Sokolovic, Michael Schmid, Martin Setvin, and Ulrike Diebold — Institute of Applied Physics, TU Wien, Vienna, Austria

The intrinsic polarity of the KTaO3 (001) surface can be compensated in various ways - by defects, surface reconstructions, or a hydroxylated overlayer1. The influence of the polarity on molecule adsorption is a fundamental question with further impact on practical applications. Here, we employ a combined scanning tunnelling microscopy (STM) and atomic force microscopy (AFM) system to study CO adsorption on the bulk-terminated KTaO3 (001) surface. CO preferentially adsorbs on TaO2-terminated terraces and we discuss its possible coupling with 2DEG-like electronic states of the substrate. Two distinctly different adsorption configurations were found, where the corresponding CO molecules show significantly different chemical interaction with the AFM tip, and are arranged in a pattern similar to the electronic standing waves induced by the 2DEG.

Reference: 1. M. Setvin et al., Science 359, 572 * 575 (2018)