Comparisons of electrical and optical properties between graphene and silicene — A review
Wirth-Lima A J1, 2, †, Silva M G3, Sombra A S B1, 2
       

(a) Schematic representation referring to the 3 × 3 superstructure of the isolated silicene. (b) Schematic representation of the 4 × 4 superstructure of the Ag (111) surface. (c) Schematic representation of the superstructure (4 × 4) −α.