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O: Fachverband Oberflächenphysik

O 54: Metallic Nanowires on Semiconductor Surfaces

O 54.5: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1C

Gold-induced Surfaces on Stepped Germanium: Growth and Characterization — •Tim Wagner, Julian Aulbach, Ralph Claessen, and Jörg Schäfer — Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg

Adsorption of gold atoms on stepped Ge(hhk) surfaces leads to the formation of atomic wires via self-organization. Inspired by interesting physics such as spin chains on the step edges of similar gold-induced Si(hhk) surfaces [1], we establish recipes for the preparation of several gold-induced Ge(hhk) surfaces. Therefore, the preliminary sputter and anneal treatment of the stepped Ge(335), Ge(557) and Ge(553) substrates as well as the adsorption procedure of gold atoms provided by an electron beam evaporator have been optimized to achieve well-ordered surfaces. Due to the adsorption of gold atoms some Ge(hhk) surfaces undergo a refacetting in order to form a stable gold-induced surface. Based on scanning tunneling microscopy and low energy electron diffraction we determine the formation of surface reconstructions on the atomic scale on the Ge(hhk)-Au surfaces. In particular, we have characterized these surfaces regarding the formation of atomic wire structures, such as those formed by the Au and Ge atoms, and will present first indications for the occurence of superstructures.

[1] J. Aulbach et al., Nano Lett. 16(4) (2016).