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.
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Horsch, P. (1981). Electronic Correlation Effects in Cyclic Polyenes and in Polyacetylene. In: Pietronero, L., Tosatti, E. (eds) Physics of Intercalation Compounds. Springer Series in Solid-State Sciences, vol 38. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81774-8_17
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DOI: https://doi.org/10.1007/978-3-642-81774-8_17
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