CIRCULARLY-POLARIZED EXCITON EMISSION AND FINE-STRUCTURE OF THE LUMINESCENCE BAND IN ZN1-XCDXSE ZNSE MQWS/

Circular polarization of exciton photoluminescence (PL) in MBE grown Z nCdSe/ZnSe MQWs at T = 2K has been studied in Faraday configuration up to 7 T. We have found that in strong magnetic fields the PL band shap e is sensitive to polarization sign of circularly polarized exciting l ight. On this basis, we were able to decompose the PL band into two co mponents of approximately equal intensity and width (FWHM = 12 meV) bu t with the maxima separated by 7 meV. In accordance with different fie ld dependence of polarization degree for the two bands, the high-energ y component has been assigned to emission of excitons localized by com positional and/or well-width fluctuations (LE), while the other compon ent was attributed to excitons bound to neutral donors (D-x(O)). Elect ron and hole g-factors as well as the relaxation times and parameters of energy-spin diagram for LE have been estimated.