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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.28: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

The formation of Au nanowires on Ge(001): an ab-initio study — •Simeon Sauer¹, Frank Fuchs¹, Jürgen Furthmüller¹, Friedhelm Bechstedt¹, Christian Blumenstein², Sebastian Meyer², Jörg Schäfer², and Ralph Claessen² — ¹Institut für Festkörpertheorie und -optik, Universität Jena, D-07743 Jena — ²Physikalisches Institut, Universität Würzburg, D-97074 Würzburg

Deposition of approximately 0.5 ML of Au on the Ge(001) surface leads to self-organized formation of chains along the [110] direction [1]. These chains are characterized by some unprecedented features: low-defect growth, high aspect ratio and rather high spacing between adjacent chains. This system seems to be a possible candidate for the formation of a Luttinger liquid.

Assuming a c(8x2) translational symmetry we propose several models of Au chain structures. They are investigated in the framework of a density functional theory approach. For each model, different features including surface energy, STM images, band structure, etc. are calculated. The computed properties are compared to experimental data and used to evaluate the different models.

[1] J. Schäfer, C. Blumenstein, S. Meyer, M. Wisniewski, and R. Claessen, Phys. Rev. Lett. 101, in press (Dec. 2008).