Effects of electron-impurity scattering on density of states in silicene: impurity bands and band-gap narrowing

摘要

Considering the interband correlation, we present a generalizedmultiple-scattering approach of Green's function to investigate the effects ofelectron-impurity scattering on the density of states in silicene. Thereduction of energy gaps in the case of relatively high chemical potential andthe transformation of split-off impurity bands into band tails for low chemicalpotential are found. The dependency of optical conductivity on the impurityconcentration is also discussed for frequency within the terahertz regime.