Trapped bipolaron due to interimpurity interactions in doped conjugated polymers: Two-impurity problem and dependence on impurity-potential forms

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Abstract
Effects of interimpurity interaction in conjugated polymers are numerically investigated. The Su-Schrieffer-Heeger Hamiltonian is studied with two acceptor-type long-ranged impurities that have anisotropic dielectric constants and a screening factor. Direct interimpurity repulsion is taken into account. Impurity clustering occurs and a trapped bipolaron is formed when the range of the impurity potential is long enough. Optical absorption has only one midgap absorption peak due to the strong impurity potential. Impurities are isolated from one another when the range becomes shorter.