Figure 11: The calculated absorption coefficient.
Optical conductivity
The optical conductivity is displayed schematically in Fig. (12), wherein, blue color line represents real component while red color defines the imaginary part of the conductivity. The real part of the conductivity is found to be zero till the frequency slightly less than its threshold value. Nevertheless, values of the real conductivity rise abruptly to attain its maximum value of 6.0 (fs)-1 at the cut-off frequency of 8.0 eV. Beyond this frequency limit, conductivity decreases sharply, and ultimately becomes zero at 12.5 eV leading to the fact that no incident radiations could pass through the considered compound very far from this particular frequency limit (12.5 eV). Generally, the real part of the optical conductivity has followed the similar fascinating trend as that of the absorption coefficient and imaginary components of the dielectric function/refractive index. As regard the imaginary part of the conductivity has shown counterintuitive behavior since it is found to extend in negative region of the conductivity where maximum conduction of incident electromagnetic radiations has been observed. And that gradual escalation in its values has been noticed, in the region where, real conductivity is being decreased sharply.