The theoretical framework for conduction-band quantum well structures is presented and the energy band structure and the allowed wave functions are calculated. Then, by using the Fermi Golden Rule, transition rates between different subbands of quantum wells are described. The developed theory is applied to some GuAdAIGds quantum wells and the results are physically interpreted. Finally, the possibility of cr-ting the populafion inversion for the laser action in-an asymmetric step quantum well is briefly studied.
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