EXCITON BINDING-ENERGIES AND OSCILLATOR-STRENGTHS IN A SYMMETRICAL ALXGA1-XAS GAAS DOUBLE-QUANTUM-WELL/

Within the framework of the effective-mass approximation, we have used an improved three-parameter trial function to calculate the exciton b inding energy for both the ground state and the excited states in a sy mmetric double quantum well. When comparing our results with those der ived with the commonly used one-parameter trial function, we found tha t the binding energies are improved significantly, especially for the excited states. Our calculated exciton transition energies agree well with the measured photoluminescence-excitation (PLE) spectra. We have also calculated the oscillator strengths. By comparing our results wit h the oscillator strength derived from the PLE spectra, we find good a greement for heavy holes, but less satisfactory agreement for light ho les.