Bond length order parameter of conjugated polymers

Chih Ming Lai, Hsin-Fei Meng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


It is usually assumed that the ground state lattice configuration of polyacetylene is a dimerized chain. We found that the energy can be further reduced by an overall chain length contraction, which leads to a new bond length order parameter, in addition to the well-known bond alternation order parameter. For quasi-particles like solitons and polarons, these two order parameters are coupled with the electron wave functions and vary in space. We generalize the Takayama-Liu-Maki equations in the continuum limit to incorporate this new order parameter. Significant modifications are found for the polaron solution. Polyacene, a ladder polymer, is also studied with the inclusion of the bond length order parameter. The ground state is predicted to be a non-alternating structure, with zero energy gap and unusually high electric conductivity.

Original languageEnglish
Pages (from-to)332-342
Number of pages11
JournalPhysica B: Condensed Matter
Issue number1-4
StatePublished - Nov 1999


  • Conjugated polymers
  • Polarons
  • Solitons

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