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New evidence for the influence of step morphology on the formation of Au atomic chains on vicinal Si(111) surfaces

McAlinden, N. and McGilp, J. F. (2010) New evidence for the influence of step morphology on the formation of Au atomic chains on vicinal Si(111) surfaces. EPL: A Letters Journal Exploring the Frontiers of Physics, 92 (6). -. ISSN 0295-5075

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Abstract

Gold atomic chain structures that grow on singular and vicinal Si(111) surfaces have attracted considerable interest as model systems for exploring quasi-one-dimensional metallic behaviour. The structure of the prototypical Si(111)-5 x 2-Au system remains controversial, however. Reflection anisotropy spectroscopy provides new, independent evidence supporting a recently proposed three-Au-chain structure. For stepped surfaces, the results provide good evidence that a single Au chain forms adjacent to [(1) over bar(1) over bar2] steps and a double Au chain forms adjacent to [11 (2) over bar] steps. In both cases spectral lineshape and coverage data support a three-chain Si(111)-5 x 2-Au structure forming over the remainder of the terrace. For all the vicinal Si(111) surfaces, including Si(557) and Si(775), it is the step morphology, and not the terrace width, that determines whether single- or double-Au-chain structures are formed in the region of the steps.

Item type: Article
ID code: 36982
Keywords: SI surfaces, electromigration, anisotropy , silicon, gold, Optics. Light, Physics and Astronomy(all)
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Institute of Photonics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 24 Jan 2012 09:37
    Last modified: 05 Sep 2014 14:37
    URI: http://strathprints.strath.ac.uk/id/eprint/36982

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