The Effect of Buckled Configuration of the Unit Cell on Optical Properties in Silicene Nano-structure

In this paper, the effect of the buckled configuration on dielectric function of silicene is investigated. The behavior of the optical absorption spectrum and the refractive index dispersion are studied using the density functional theory in terms of incident photon energy at different buckling heights. Results are shown that for the fixed bond length, increasing the buckling height in unit cell increases the absorption and the refractive index. In addition, their peaks shift toward the longer wavelengths red shift. For this, the behavior of the optical absorption spectrum and refractive index dispersion at different buckling heights are illustrated. Reducing the band gap with increasing the buckling height is the physical interpretation of the behaviors.