Theory of solitons, polarons and multipolarons in one dimension: An alternative formulation

Details Theory of solitons, polarons and multipolarons in one dimension: An alternative formulation Theory of solitons, polarons and multipolarons in one dimension: An alternative formulation

1999-12-09

arxiv.org/abs/cond-mat/9912146v1

Physics

Condensed Matter

13 pages, 1 figure, to appear in Physical Review B

Scientific paper

We develop an alternative formulation of the theory of solitons, polarons and multipolarons in quasi-one-dimensional degenerate and non-degenerate conducting polymers, starting from the continuum Hamiltonian introduced by Brazovskii and Kirova. Based on a convenient real-space representation of the electron Green function in one dimension, we present a simple method of calculating the Green function and the density of states in the presence of a single soliton or polaron defect, using which we derive exact expressions for the soliton, polaron and multipolaron excitation energies and the self-consistent gap functions for an arbitrary value of the electron-phonon coupling constant. We apply our results to $cis$-polyacetylene.

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