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Observation of resonant Faraday rotation of excitonic polaritons [1] has opened a new possibility of studying scattering processes of polaritons. Polarization lifetime can be measured using the exciton spin precession in an external magnetic field as a clock. The application of resonant Faraday rotation to semimagnetic semiconductors, reported first for a Raman cascade involving intra-ion transitions in (Cd,Fe)Se [2], takes advantage of giant effective gyromagnetic faction due to exchange interaction between Fe++ ions and band electron states. As a consequence, much shorter processes can be studied (down to the subpicosecond range). In this work we apply for the first time the resonant Faraday rotation method to cubic semimagnetic semiconduction (Zn,Fe)Se and (Zn,Cr)Se. Raman scattering measurements were performed in backscattering geometry using a linearly polarized 10 mW beam of a He-Cd laser. The photon energy of the laser light was 2.808 eV, whereas the free exciton energy in our samples was between 2.806 eV and 2.811 eV. Our measurements were thus done under resonance conditions. The samples were placed at 2 Κ in a superconducting magnet (Faraday configuration). The spectra were analyzed as described previously [3], using a 1 m double grating monochromator and a GaAs photomultiplier in the photon counting regime. Polarization measurements were performed using an elastooptical . modulator. In order to determine the linear polarization state of the diffused light, the polarization degree was measured twice with the analyzing system rotated by 450. The two measured values constitute the real and imaginary parts of a complex polarization degree V.

Scattering Dynamics of Excitons in ZnSe Based Semimagnetic Semiconductors