OPTICS AND MAGNETOOPTICS OF ZNSE HETEROEPITAXIAL LAYERS

Absorption, reflection, photoluminescence and magneto-absorption of MB E grown ZnSe heteroepitaxial layers and MQWs in ZnSySe1-y/Zn1-xCdxSe h ave been studied on etched from the substrate, deformation free, super -thin samples at T = 1.7 K and B less than or equal to 7.5 T. Analysis of oscillatory magneto-absorption spectra gives the possibility to es tablish a new set of ZnSe band parameters with a ''bare'' electron eff ective mass m(c) = 0.123 m(0). Renormalization into a ''polaron'' set is necessary to describe exciton series. The combined use of these tw o sets permits us to obtain a good description of MQW excitonic spectr a. The specific Fabry-Perot interference picture, characteristic for e xciton-polariton phenomena, was observed in super-thin ZnSe samples.