Abstract
AbstractThe effective medium theory of diffusion in topologically disordered systems is reviewed with emphasis on the description of disorder induced anomalous diffusion. The effective medium approximation (EMA), for which a new derivation is given, is shown to provide a reliable and simple scheme to discuss the diffusive motion of particles in disordered systems such as electrons in the localized energy region of disordered semiconductors or ions in amorphous solids. Explicit calculations for some pertinent models are presented and the consequences of anomalous diffusion to a.c. conductivity, transient photoconductivity, neutron scattering and NMR data are discussed.
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