STUDY OF THE LOCALIZATION LENGTHS IN NONPERIODIC GAAS AL0.3GA0.7AS SUPERLATTICES/

Electronic states and the wavefunction localization lengths for non-pe riodic GaAs/Al0.3Ga0.7As superlattices are calculated and also studied experimentally using photoluminescence. Non-periodicity causes the fi rst bound state to shift down in energy. A relation between the shift in energy from the periodic case and the wavefunction localization len gth is derived and used to obtain the localization length experimental ly from photoluminescence measurements. The localization length thus o btained is compared with the results from a direct calculation of the wavefunction.