Abstract
Quantum well (QW) structures composed of a diamagnetic narrow gap IV-VI semiconductor (PbTe, PbSe) and a dilute magnetic compound (PbMnTe, PbMnSe, PbEuTe) are investigated by various magneto-optical methods as coherent anti-Stokes Raman scattering (CARS), interband-absorption and photoluminescence. The CARS experiments yield precise values of the spin splittings of valence and conduction bands as a function of magnetic field and temperature. By interband transmission energy gaps and effective masses are determined.The data are analyzed in the framework of an envelope function approach taking into account the exchange interaction between free charge carriers and the magnetic moments of the paramagnetic ions in a molecular field approximation. A comparison of the spin splittings of the bands in the QWs with those observed in homogeneous materials yields information on the probabilities to find the mobile carriers in the diamagnetic and the semimagnetic layers, respectively. This information allows the determination of the type of the superlattice and of the band offsets at the interfaces.
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