Polaron effects on the optical properties in a strained diluted magnetic quantum well

The effect of longitudinal optical phonon field on the exciton in a Cd 1 − x o u t Mn x o u t Te / Cd 1 − x i n Mn x i n Te / Cd 1 − x o u t Mn x o u t Te strained quantum well is investigated using the Aldrich–Bajaj effective potential. Spin polaronic shifts are estimated using mean field theory for different Mn concentration and the well sizes. A theoretical study of diluted magnetic semiconductors treating local sp-d exchange interaction J between the itinerant carriers and the Mn electrons is treated within a realistic band structure. The total optical absorption and the refractive index changes as a function of normalized photon energy in the presence of polaron and the Mn ion content are analyzed. Our results show that the occurred red shifts of the absorption resonant peak due to the polaron in CdMnTe give the information about the variation of two energy levels in the quantum well. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity, the polaronic effect and the Mn content.