Silicene vs. ordered 2D silicide: the atomic and electronic structure of   the Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface   reconstruction
  We discuss the possibility of a 2D ordered structure formed upon deposition of Si on metal surfaces. We investigate the atomic and electronic structure of the Si-$(\sqrt{19}\times\sqrt{19})R23.4^{\circ}$/Pt(111) surface reconstruction by means of a set of experimental surface-science techniques supported by theoretical calculations. The theory achieves a very good agreement with the experimental results and corroborate beyond any doubt that this phase is a surface alloy consisting of Si$_3$Pt tetramers that resembles a twisted Kagome lattice. These findings render unlikely any formation of silicene or germanene on Pt(111) and other transition metal surfaces. 
Martin Svec and Prokop Hapala and Martin Ondracek and Maria Blanco-Rey   and Pablo Merino and Pingo Mutombo and Martin Vondr...
cond-mat.mtrl-sci