Absence of impurity bands in conjugated polymers

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Abstract
Electronic states in conducting polymers containing impurities are analyzed. The influence of backward and forward scattering (bond and site) impurities is studied using the coherent potential approximation. Because of the 1D nature of the problem, the formation of impurity bands in the gap, as known from different circumstances such as semiconductors and superconductors, is suppressed if strength of the bond impurity is larger than that of the site impurity. Consequences for the interpretation of experiments are discussed.