MAGNETOOPTICAL PROPERTIES OF GAAS-(GA,AL)AS SUPERLATTICES

A theoretical calculation of the magnetoabsorption spectra of GaAs-(Ga ,Al)As superlattices under in-plane magnetic fields is performed. We c onsider interband transitions between electron- and hole-magnetic leve ls within the parabolic effective-mass approximation and with the enve lope wave functions obtained by an expansion in terms of sine function s. Due to the presence of the superlattice potential, interband transi tions involving Landau levels n and n' with DELTAn not-equal-to 0 may occur with significant contributions to the magneto-optical absorption spectra. The calculated magnetoabsorption spectra for varying in-plan e magnetic fields are in quantitative agreement with experimental data .