Reflectance anisotropy studies of 5 × 2-Au structures grown on Si(111) surfaces with different step formations

摘要

Reflection anisotropy spectroscopy (RAS) studies are reported of Si(111)-5 × 2-Au structures grown on substrates with different offcuts and step densities. Such substrates produce a predominant domain on the (111) terrace that would otherwise produce a negligible RAS signal, due to domain averaging. Changes in the RASrnspeclra with offcut angle are observed in the 1 to 3 eV region, where Au-induced structures appear. Results from offcuts towards [112] of 2°, 3°, 9.5°, and -4° are presented. The variation in the RAS spectra is consistent with different populations of single- and double-chain gold structures formed in the region of the steps.