Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks
O 51.8: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1C
New atomic models for Au-induced wire structures on Ge(001) surfaces at higher Au coverages — •Kaori Seino1, Simone Sanna1, Wolf Gero Schmidt1, and Friedhelm Bechstedt2 — 1Lehrstuhl für Theoretische Physik, Universität Paderborn, Paderborn, Germany — 2Institut für Festkörpertheorie und -optik, Friedrich-Schiller-Universität Jena, Jena, Germany
One-dimensional (1D) electronic systems have been investigated extensively because of the interest both in fundamental physics and in nano or atomic scale devices. The atomic structure of Au-induced nanowires on Ge(001) substrates, which arguably belong to the most interesting quasi 1D systems, is still under discussion despite intensive research.
We have studied the structural, energetic and electronic properties of Au-induced nanowires on Ge(001) surfaces by means of density functional theory calculations [1,2]. We start the investigations from the original and a modified giant missing row structure, the Au-trimer stabilized Ge ridge model [3]. Three new structures for a higher Au coverage in the range between 1.25 monolayer (ML) and 1.75 ML are proposed. It it found that the new models are energetically more favorable than the models proposed previously. Moreover, they are able to explain several features of the experimental results.
[1] K. Seino and F. Bechstedt, Phys. Rev. B 93, 125406 (2016).
[2] K. Seino and F. Bechstedt, J. Phys.: Condens. Matter 28, 284005 (2016).
[3] S. Sauer et al., Phys. Rev. B 81, 075412 (2010).