Abstract
The electron-electron interactions and the creation energy of a soliton in highly conducting polymers were calculated by using a correlated-basis-function method with a general screening Coulomb potential within the Kronig-Penny-model framework. Our results showed that even when the electron-electron interactions are considered, solitons are still the main charge carriers. The strong long-range electron-electron interaction is seen to reduce the creation energy of a soliton. A comparison with results based on the Hubbard model has been made. The limitations of the Hubbard model in this application were discussed.
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