Effects of Hydrostatic Pressure on Optical Absorption and Refractive Index Changes of Exciton in Semimagnetic CdMnTe Quantum Wells

Abstract

Pressure induced binding energy of a confined exciton in a Cd 1−x out Mn x out Te/Cd 1−x in Mn x in Te/ Cd 1−x out Mn x out Te diluted magnetic quantum well is investigated. Calculations are performed for various Mn incorporation into Cd 1−x Mn x Te 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 the 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 pressure and the Mn ion content are analysed. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and the pressure. The occurred blue shift of the resonant peak due to the pressure gives the information about the variation of two energy levels in the quantum well width. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and the pressure and Mn content.