The electronic structure and optical properties of intermixed GaAs/AlGaAs double quantum wells

We report photoluminescence and photoluminescence excitation (PLE) investigations of intermixed GaAs/AlGaAs double quantum wells. The PLE spectra provide energy information about many different transitions, from which the band profile can be more reliably derived. Using the widely assumed error function profile, it was not possible to explain the observed results. Detailed analysis revealed that the as-grown sample had a graded interface which affected the band profile for the intermixed samples.