Growth of silicene layers on Ag(111): unexpected effect of the substrate   temperature
  The deposition of one silicon monolayer on the silver (111) substrate in the temperature range 150-300$^\circ$C, gives rise to a mix of (4$\times$4), ($2\sqrt{3}\times 2\sqrt{3}$)R30$^\circ$ and ($\sqrt{13}\times\sqrt{13}$)R13.9$^\circ$ superstructures which strongly depends on the substrate temperature. We deduced from a detailed analysis of the LEED patterns and the STM images that all these superstructures are given by a quasi identical silicon single layer with a honeycomb structure (i.e. a silicene-like layer) with different rotations relatively to the silver substrate. The STM images morphology are explained from the relative position of the silicon atoms relative to the silver atoms. A complete analysis of all possible rotations of the silicene layer predicts also a ($\sqrt{7}\times\sqrt{7}$)R19.1$^\circ$ superstructure which has not been observed so far. 
H. Jamgotchian (1), Y. Colignon (1), N. Hamzaoui (2), B. Ealet (1), J.   Y. Hoarau (1), B. Aufray (1) and J. P. Bib\'erian (...
cond-mat.mtrl-sci