Exchange interaction in semimagnetic IV-VI multi-quantum-well structures

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Abstract
Diluted magnetic IV-VI semiconductors like Pb1-xMnxTe or Pb1-xMnxSe exhibit a strong dependence of the effective g-factors of the free carriers on temperature and magnetic field, caused by an exchange interaction between the free carriers and the magnetic moments of the paramagnetic ions. In quantum wells or superlattices the strength of the exchange interaction depends on the probability of finding the carriers within the diluted magnetic component. With various PbSe/Pb1-xMnxSe superlattices the authors performed coherent anti-Stokes Raman scattering (CARS) experiments in the mid-infrared using CO2 lasers to obtain very precise data on the spin splittings of electrons and holes. The analysis of these CARS data in the framework of an envelope-function approximation yields a type-l' alignment with electrons confined in the Pb1-xMnxSe layers and holes in the PbSe layers.