Studies of photoreflectance in Cd1-xMnxTe/Cd1-yMnyTe superlattices

Photoreflectance spectroscopy has been performed on a series of Cd1-xMnxTe/Cd1-yMnyTe superlattices. Samples were grown on (001) GaAs substrates by molecular-beam epitaxy with different barriers (x=0.3 to 0.8) and wells (y=0 to 0.01). After taking into consideration the strain-induced and quantum confinement effects, the exciton transition energies of the heavy and light holes can be determined using envelope-function calculations. The calculations are in good agreement with the photoreflectance measurement results. These results show that photoreflectance is a powerful probe for the study of quantized state structures in superlattices.EI