Model Dielectric Constants of InSb

A calculation of the real (ϵ1) and imaginary (ϵ2) parts of the dielectric function of InSb between 0.0 and 6.0 eV in the temperature range 100 to 650 K is presented. This model includes the E0, E0 + Δ0, E1, E1 + Δ1, E'0, E'0 + Δ'0, E2 and E'1 gaps as the main dispersion mechanisms. The model is also made to account for the excitonic effects at the E1 and E1 + Δ1 critical points (CP's). The lineshape of the optical spectra obtained from this model is in satisfactory agreement with the experimental data over the entire range of photon energies. The temperature dependence of the strength and the broadening parameter at each CP are also given and discussed.