The 4th International Meeting on Silicene was held June 11-12 at the Institute of Physics, Chinese Academy of Sciences in Beijing, China. Twenty-five talks given by researchers from over 15 different groups from around the world led to very animated discussions on old problems such as the existence of 3×23 superstructure on silver to more recent ones about the origin of the linear electron dispersion observed experimentally and about the structure of multilayer silicene on silver.
3X23 superstructure was presented. Consensus seems to be developing that the linear electron dispersion observed experimentally is really a hybrid of the linear dispersion of the Dirac cone and of the silver sp bands. One group has reported the multilayer silicene to consist of weakly interacting layers due to the absence of silicon signatures in Raman experiments whereas other groups disagreed. Baskaran proposed a correlation mechanism for the possibly weak interlayer bonding, and the prediction of room temperature superconductivity for silicene.
A number of computational studies of silicene on non-metallic substrates was presented, with the most likely candidate being GaSe. The recent report of the instability of silicene on Ag was repeated by Dr. Poelsma though it was made clear that this is only one study and that spectroscopic data were not available.
All in all, it was a great meeting with most of the silicene experts present. The organizer, Prof. Wu, did an excellent job organizing this meeting with substantial financial support from the Chinese Academy of Sciences.