Effects of the second and third neighbor hopping interactions on the electronic states of soliton in polyacetylene |
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Authors: | Z. J. Li Z. An K. L. Yao Z. G. Li |
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Affiliation: | (1) Department of Physics Huazhong University of Science and Technology, 430074 Wuhan, People's Republic of China;(2) Center of Theoretical Physics CCAST (World labortory), Department of Physics, Huazhong University of Science and Technology, 430074 Wuhan, People's Republic of China;(3) National Laboratory of Laser Technology Huazhong University of Science and Technology, 430074 Wuhan, People's Republic of China |
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Abstract: | We have studied the energy spectra and the electronic states of a soliton in the weakly coupled electron-phonon systems using an extension of SSH model that includes non-nearest neighbor hopping interactions. The results show that: (1) the electron-hole symmetry of the energy band structure implied by SSH model is broken, and the energy gap 2 increases. (2) for a negative charged soliton, only two bound states have been found, one of them is the midgap state, another is a new shallow state near the bottom of the conduction band; for a neutral soliton, all three bound states exist as in the SSH model, but their localizations are strengthened; for a positive charged soliton, four bound states have been found, one of which is an additional state near the top of the conduction band. |
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Keywords: | 71.20Hk 63.20Kr |
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