OPTICAL PROBING OF INTERMIXING IN GAAS-ALGAAS MULTIQUANTUM WELLS

It is shown that a combination of low-temperature photoluminescence an d luminescence excitation spectroscopies together with appropriate mod elization can provide the precise information needed for a thorough co ntrol of interdiffusion in quantum well structures. A fit of observed and calculated transition energies up to five energy levels, using the interdiffusion length as a unique parameter, is considered. The poten tiality of this procedure to fully characterize the interdiffusion pro cess is illustrated by considering the examples of lightly and heavily intermixed GaAs-AlGaAs multiquantum wells.