Abstract
Most papers written nowadays on polyacetylene [1,2] seem to accept as a well-established fact that the origin of the optical gap in trans-(CH)x is due to bond alternation arising from the Peierls instability. Yet a completely different explanation for the origin of the optical gap has been given by OVCHINNIKOV and coworkers [3], who suggested that the gap results from electronic correlations and not from bond alternation. Estimating the relevant physical parameters for polyacetylene from substances such as ethane, benzene, ethylene and graphite [4], they concluded that the electron-phonon coupling is much too small to produce a bond alternation large enough to explain the measured gap.KeywordsCorrelation EnergyElectronic Correlation EffectBond AlternationStretch Force ConstantHubbard InteractionThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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