POLARIZABLE SCATTERING CENTERS IN A FLUCTUATION APPROACH TO CHARGE-TRANSPORT

We present a detailed derivation of the fluctuation transport theory, previously developed by Gerlach and Mycielski. The basic idea is the t ransformation of carrier-densities and fields into the rest frame of e ach type of carriers and application of the Fluctuation-Dissipation-th eorem for monopolar, unscreened carrier densities. In the present pape r, the theory is applied to a model system containing free electrons, rigid ions and polarizable neutral donors. We compare our results with experimental data for the polar II-VI-semiconductor Eu1-xSrxS.