Magneto-Optical Properties of Cd1-xMnxTe Multiple Quantum Wells Prepared by the ICB Technique

Cd1-xMnxTe/MnTe multiple quantum well structures were successfully grown on a sapphire (0001) substrate by using the ionized-cluster beam (ICB) technique, and their optical and magnetooptical properties were investigated. Transitions to the subband levels formed in wells were observed in the optical absorption and magneto-circular dichroism (MCD) spectra. The transition energies shifted widely toward higher energies as the well width was decreased. The experimental results for subband energies agreed well with the results calculated using the Kronig-Penney band model. The change in MCD peak height with the well width can be explained by the Zeeman splitting of the subband levels and the oscillator strengths of transitions to those levels.