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    • Electron-electron interactions in polyacetylene

      S Ramasesha

      Volume 96 Issue 6 April 1986 pp 509-521

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/096/06/0509-0521

    • Keywords

       

      Electron correlation; valence bond method; polyacetylene; optical gap; spin densities

    • Abstract

       

      Experimental evidence for strong electron-electron interactions in polyacetylene is presented. These include (i) observation of a dipole forbidden state below the optical gap, (ii) observation of negative spin densities at sites at which noninteracting models predict zero spin density (iii) vanishing optical gap, in the infinite chain limit, in the closely related symmetrical linear cyanine dyes. To correctly explain these features it is necessary to solve correlated model Hamiltonians. Using diagrammatic valence bond method model exact solutions of correlated models of finite-size systems can be obtained and various physical properties of the low-lying states can be computed. These properties, when extrapolated to the infinite chain limit explain many of the experimental features observed in polyacetylene.

    • Author Affiliations

       

      S Ramasesha1

      1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore - 560 012, India

    • Dates

       
      Published
      April 1986

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