Study of the localization lengths in non-periodic GaAs/Al0.3Ga0.7As superlattices

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