Abstract
Peierls lattice distortion has been investigated in substituted polyacetylenes. We find that the Peierls dimerization could be suppressed by the substitution of hydrogen atoms with phenyl or methyl. A study on an oligomer by a Lanczos exact diagonalization algorithm indicates that the inclusion of Hubbard repulsion does not change the result. The expected quadrimerization, which is required by the Peierls theorem, does not appear in poly(methyl-acetylene).
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