EXCITONIC EFFECTS IN LINEAR AND PHOTOINDUCED FARADAY-ROTATION IN SEMIMAGNETIC SEMICONDUCTORS

We investigate the influence of the Coulomb interaction on the giant l inear and photoinduced Faraday rotation in the bulk Cd1-xMnxTe system. Experimental results are presented and discussed by calculating the c omplex dielectric function. The anisotropy and kappa-dependence of the magnetic spin-exchange interaction and the Coulomb interaction betwee n optically excited bound and unbound electron-hole pairs are consider ed using a microscopic theory. At high excitation densities, the excit onic nonlinearities of the 1s transitions are investigated. PACS numbe rs: 78.66.Hf, 78.20.Ls, 75.30.Et, 42.65.-k.