A review of the growth and structures of silicene on Ag (111)
Wu Ke-Hui†a),b)
       
(a) High-resolution topography STM image taken on a domain showing a large hexagonal pattern. U = 3 mV and I = 0.2 nA. (b) Enlarged STM image cut from the square indicated in panel (a). (c) Ball structural model for the vortex pattern shown in panel (b) (adapted from Ref. [ 38 ]).