Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 90: Poster Session - Semiconductor Substrates: Metallic Nanowires, Overlayers, etc.

O 90.1: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/1OG

Dimerization, self-doping and step-step correlation of Au chains on Si(553) — Zamin Mamiyev, •Priyanka Yogi, and Herbert Pfnür — Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover, Germany

Adsorption of 0.48 of a monolayer of Au on the regularly stepped Si(553) surface leads to the formation of one double chain of Au per terrace by self-organization. They are considered as a prototype of a quasi one-dimensional system. However, since the interaction with the Si surface results in modifications of the Si surface states, this system turns out not to be purely 1D. In this study we explore the conditions of quasi-1D behavior in more detail by variation of the Au concentration, starting at the optimal concentration of 0.48 ML, as judged from maximum slope and intensity of plasmon dispersion. LEED shows an enhanced coupling between the Au wires at slightly smaller Au concentrations, while a Au surplus up to 0.03 ML adsorbed at RT, dopes the system, removes stacking faults from the wires and simultaneously enhances dimerization, but effectively decouples the wires. By annealing above 630^∘ C the Au atoms are collected in √3-ordered clusters with a local concentration of 1ML. Concerning long range order of Au chains, the situation with 0.48 ML Au is restored. The same hold for the plasmon dispersion. Geometric models to explain these properties are discussed.