Anisotropy of magnetooptical absorption of quantum dot-impurity center complexes

The magnetooptical properties of 〈quantum dot〉-〈impurity center〉 complexes formed in a transparent insulator host were studied. In order to describe one-electron states of a quantum dot, a parabolic model of the confinement potential was used. In terms of the zero-range potential model in the effective-mass approximation, the coefficient of extrinsic absorption of light polarized parallel and perpendicular to the direction of an external magnetic field (longitudinal and transverse polarizations, respectively) was calculated taking into account variance in the quantum-dot size. It was shown that, in the case of longitudinal polarization, the edge of the extrinsic-absorption band shifts in a magnetic field to shorter wavelengths and the absorption coefficient increases several times. In the case of transverse polarization, the quantum-dimensional Zeeman effect is observed in the extrinsic-absorption spectrum. It was also shown that the anisotropy of the magnetooptical absorption is a nonmonotonic function of the frequency of light and does not depend critically on the impurity-level position.