We study effects of the π electron Coulomb interaction on breathers in trans-polyacetylene utilizing the Pariser-Parr-Pople (PPP) model. Charged solitons with opposite charges and neutral solitons with antiparallel spins, respectively, have attractive interactions and make dynamical bound states of two kinds, zwitterionic and diradical breathers. We numerically simulate adiabatic lattice motions to demonstrate the breather oscillations. The zwitterionic and diradical breathers have different energies, spatial extents and oscillation periods but have similar oscillation patterns. They may explain the ionic and neutral excitations observed in the photoinduced absorpiton spectra of trans-polyacetylene. The zwitterionic breather may also explain the self-pinning of photogenerated charged solitons.
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Sasai et al. (1988) studied this question.
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