Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Metallic Nanowires on Semiconductor Surfaces

O 18.6: Poster

Montag, 7. März 2016, 17:00–19:30, Poster A

Au nanowires at Si(775): Structure, electronic bands and magnetic ordering calculated from first principles — •Christian Braun, Simone Sanna, and Wolf Gero Schmidt — Theoretische Physik, Universität Paderborn, 33095 Paderborn, Germany

In recent years, one-dimensional systems have increasingly come into focus due to their interesting electronic properties including, inter alia, Peierls instabilities and Luttinger liquid behavior. Promising realizations of quasi-one-dimensional systems are, among others, self-assembled gold nanowires on vicinal Si(111) surfaces.

However, the exact structure of many gold deposited vicinal Si(111) surfaces are still unclear. In this work, various structures of gold chains on the Si(775) surface have been investigated by first-principles and, depending on the gold coverage, different models for this particular surface are proposed. These are supported by STM simulations and calculations of the band structure. Interestingly, we find the energetically most favored models to show a magnetic ordering, similar to the case of Au/Si(553) surface [1].

SC Erwin, FJ Himpsel, Nature Commun. 1, 1 (2010).