Interaction and disorder in charge density waves - application to polyacetylene

B. Horovitz, J. Sólyom

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Charge density waves (CDW) in one dimensional conductors are studied with the following interactions: electron-phonon (e-p), electron-electron (e-e) and electron-disorder (e-d). The ordered system is studied with e-p interaction in the adiabatic limit and weak coupling e-e interactions with renormalization group methods. An exponent δ defines a renormalization of the effective electronic energy and gap. The effect depends on commensurability and whether the CDW is centered on sites or on bonds. The effect of weak e-d interaction introduces an exponent p. Analysis of Raman scattering, as done in polyacetylene yields a relation between phonon frequency and electronic gap. This analysis shows a different type of disorder in trans (CH)X and in mixed trans-cis (CH)X, i.e. different p values. An estimate of δ is also possible.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalSynthetic Metals
Issue number1-3
StatePublished - 1 Jan 1987

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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