Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si (111)-(5× 2)-Au surface

Conor Hogan, Elena Ferraro, Niall McAlinden, John McGilp

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The intensively studied Si(111)-(5×2)-Au surface is reexamined using reflectance anisotropy spectroscopy 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 (×2) 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.
LanguageEnglish
Article number087401
Number of pages5
JournalPhysical Review Letters
Volume111
Issue number8
Early online date22 Aug 2013
DOIs
Publication statusPublished - Aug 2013

Fingerprint

wire
gold
dimerization
high energy electrons
periodic variations
screening
electron diffraction
simulation
signatures
density functional theory
reflectance
anisotropy
spectroscopy
energy

Keywords

  • optical fingerprints
  • Si honeycomb chains
  • atomic gold wires
  • Si (111)-(5× 2)-Au surface

Cite this

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title = "Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si (111)-(5× 2)-Au surface",
abstract = "The intensively studied Si(111)-(5×2)-Au surface is reexamined using reflectance anisotropy spectroscopy 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 (×2) 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.",
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Optical fingerprints of Si honeycomb chains and atomic gold wires on the Si (111)-(5× 2)-Au surface. / Hogan, Conor; Ferraro, Elena ; McAlinden, Niall; McGilp, John.

In: Physical Review Letters, Vol. 111, No. 8, 087401, 08.2013.

Research output: Contribution to journalArticle

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AU - Hogan, Conor

AU - Ferraro, Elena

AU - McAlinden, Niall

AU - McGilp, John

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