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Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si(111)-(5x2)-Au surface (Articolo in rivista)

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Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si(111)-(5x2)-Au surface (Articolo in rivista) (literal)

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Conor Hogan, Elena Ferraro, Niall McAlinden, John F. McGilp (2013)
Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si(111)-(5x2)-Au surface
in Physical review letters; The American Physical Society, Ridge, NY (Stati Uniti d'America)
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Institute of Structure of Matter, National Research Council (CNR-ISM), Via Fosso del Cavaliere 100, Rome, Italy; Department of Physics and European Theoretical Spectroscopy Facility (ETSF), University of Rome `Tor Vergata', Via della Ricerca Scientifica 1, Rome, Italy; Laboratorio MDM, IMM-CNR, Via Olivetti 2, I-20864 Agrate Brianza, Italy; Institute of Photonics, SUPA, University of Strathclyde, Glasgow G4 0NW, United Kingdom; School of Physics, Trinity College, Dublin 2, Ireland; (literal)

Titolo

Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si(111)-(5x2)-Au surface (literal)

Abstract

The intensively studied Si(111)-(5x2)-Au surface is reexamined using reflectance anisotropy spec- troscopy and density functional theory simulations. We identify distinctive spectral features relating directly to local structural motifs such as Si honeycomb chains and atomic gold wires that are commonly found on Au-reconstructed vicinal Si(111) surfaces. Optical signatures of chain dimerization, responsible for the observed (x2) periodicity, are identified. The optical response, together with STM simulations and first-principles total-energy calculations, exclude the new structure proposed very recently based on the reflection high-energy electron diffraction technique analysis of Abukawa and Nishigaya [Phys. Rev. Lett. 110, 036102 (2013)] and provide strong support for the Si honeycomb chain with the triple Au chain model of Erwin et al. [Phys. Rev. B 80, 155409 (2009)]. This is a promising approach for screening possible models of complex anisotropic surface structures. (literal)

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