Electric field induced optical absorption and refractive index changes in a diluted magnetic quantum well

Abstract

Binding energy of a confined exciton is investigated in a Cd1−xoutMnxoutTe/Cd1−xinMnxinTe/Cd1−xoutMnxoutTe diluted magnetic quantum well in the influence of electric field. Calculations are performed for various Mn incorporation in Cd1−xMnxTe material within a single band effective mass approximation using variational method. 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 optical absorption and the refractive index changes as a function of normalized photon energy in the presence of electric field strength and the Mn ion content are analysed. Our results show that the occurred red shift of the absorption resonant peak due to the electric field gives 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 electric field strength and Mn content.