Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 18: Poster Monday: Nanostructures
O 18.4: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Au atomic wires on Si(hhk) substrates: Recent advances from experiment and theory — •Simone Sanna1, Zamin Mamiyev2, Christoph Tegenkamp3, and Herbert Pfnür2 — 1Justus-Liebig-Universität Gießen — 2Leibniz Universität Hannover — 3Technische Universität Chemnitz
The investigation of substrate-supported quasi-1D atomic wires flourished in the last decade, owing to recent advances in experimental techniques for surface analysis, and fueled by the growing demand for outstanding materials. While many 1D properties are not spoiled by structural embedding, the coupling to the environment allows modifying physical properties, e.g., the wire metallicity. In this respect, Au wires grown on vicinal Si(111) surfaces are an ideal playground, as the miscut controls the wire width (single or double atomic rows) and the interwire distance. In this contribution, we report on theoretical and experimental studies recently performed to explore the coupling of Au wires on Si(hhk) surfaces with the environment. Adsorption of H and O is found to affect differently single and double Au wires [1]. The coupling of the wires to higher dimensions through the substrate results in the breakdown of the nearly-free electron gas model [2]. Thus, the wires are more appropriately described as extremely anisotropic 2D objects than as purely 1D.
[1] Z. Mamyev et al., Phys. Rev. Mat. 2, 066002 (2018). [2] S. Sanna et al., J. Phys. Chem. C 122, 25580 (2018). [3] Z. Mamyev et al., Phys. Rev. B, submitted.