|approved||abstract_hogan_osi.pdf||2015-03-27 18:14:25||Conor Hogan|
Author: Conor Hogan
Requested Type: Pre-Selected Invited
Submitted: 2015-03-27 18:15:40
Co-authors: E. Speiser, S. Chandola, S. Suchkova, N. Esser, J. McGilp
Via Fosso del Cavaliere 100
The adsorption of gold on flat and stepped Si(111) surfaces induces regular and spatially-dense nanostructure arrays, through formation of single or multiple atomic Au chains within the terraces as well as rows of Si dangling bonds and honeycomb structures at the step edge. This intrinsic one-dimensional nature of these structural motifs, along with their unique electronic structure and optical response, makes the Si(111)-Au system ideally suitable for analysis using reflection anisotropy spectroscopy (RAS). In this presentation I will examine how careful atomistic simulations of RAS experiments provides direct insight into the surface reconstruction geometry (step morphology and buckling, Si/Au stoichiometry) and electronic structure (chain metallicity, adatom doping) across a range of similar systems. In particular I will demonstrate the ability of RAS to probe the delicate interplay between charge distribution at the step edge, adatoms, and gold chains, and when carried out in tandem with hydrogen doping, to potentially control the surface properties in a novel manner.