Abstract:An exact analysis is presented for the configurationally averaged two-body Green function of a random tight-binding model characterized by topological (e.g. positional) disorder. A general consistency relation is found between one-body and two-body Green functions, thus providing a unique and consistent way of extracting the contribution of the two-body function to the conductivity, whenever the averaged one-body Green function is available from a given approximate theory. In the effective-medium approximation… Show more
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