|approved||poster_abstract_hogan.pdf||2015-05-11 09:29:17||Conor Hogan|
Author: Conor Hogan
Requested Type: Poster
Submitted: 2015-05-08 09:23:53
Co-authors: S. Colonna, R. Flammini, A. Cricenti, F. Ronci
Via Fosso del Cavaliere 100
A number of studies have proposed that silicene--a single layer of a buckled honeycomb structure of Si atoms--is responsible for the one-dimensional nanoribbon (NR) structures observed to form when silicon is evaporated on Ag(110). Recent works using Raman and surface differential reflectance spectroscopy have cast doubts upon this interpretation, however. Here we propose new reconstruction models for Ag(110)/Si nanoribbon structures based on new Si coverage measurements and evaluate them using density functional theory simulations. Our models are shown to be thermodynamically stable, are consistent with the experimental Si and Ag coverages, and yield simulated STM images in excellent agreement with the measured data; in contrast, silicene-based models yield unsatisfactory results. This work provides clear evidence for strongly bound Si-Ag reconstructions on Ag(110), and finds little support for silicene-like structures.
Late request for poster sent to Mike Downer. No optics, unfortunately, but would complement well the talks by Borenzstein and Bechstedt.