N McAlinden and J F McGilp 2009 J. Phys.: Condens. Matter 21 474208 doi:10.1088/0953-8984/21/47/474208
N McAlinden and J F McGilp1
Show affiliationsThe distinct optical signatures of aligned single and double Au atom chain structures, grown on vicinal Si(111) substrates, have been identified using reflectance anisotropy spectroscopy (RAS). Deposition of 0.04 monolayers (ML) of amorphous Si (a-Si) at room temperature perturbs the anisotropic optical response of the double chain structure. By one third of a monolayer, no significant optical anisotropy associated with the chains remains. No anisotropic response re-emerges at higher coverages, up to 4.6 nm (14.5 ML) where there is recent evidence that the crystal structure of the double chain phase is maintained under the cap. The RAS results show that the anisotropic properties of the phase are quenched by a-Si adsorption, even though the crystal structure of the capped phase appears to be preserved.
68.35.Ct Interface structure and roughness
Condensed matter: electrical, magnetic and optical
Issue 47 (25 November 2009)
Received 31 March 2009, in final form 16 April 2009
Published 5 November 2009
N McAlinden and J F McGilp 2009 J. Phys.: Condens. Matter 21 474208
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