Figure 4

Kekulé structures of AM-covered silicene.

(a–b) Electrostatic potential distributions in Li and Cs-covered silicene with N = 16.7%. The rhombi plotted in black line represent the supercells. (c) Schemetic model of the AMSi₆ supercell. t₁ and t₂ are hopping parameters. Top and bottom silicene sublattices are colored yellow and blue, respectively. The numbers are labeling of the atom sites. (d) The k-space of the AMSi₆ supercell. The Brillouin zones of the pure silicene and the AMSi₆ monolayer are colored purple and green respectively. The K and K' Dirac points of silicene can reach each other via , (the unit vectors of the reciprocal lattice of the AMSi₆ monolayer) or their linear combination.