Effects of the Lattice Discreteness on a Soliton in the Su-Schrieffer-Heeger Model

Details Effects of the Lattice Discreteness on a Soliton in the Su-Schrieffer-Heeger Model Effects of the Lattice Discreteness on a Soliton in the Su-Schrieffer-Heeger Model

1995-09-10

arxiv.org/abs/cond-mat/9509050v3

Physics

Condensed Matter

to be appear in J.Phys.Soc.Jpn. Figures should be requested to the author. They will be sent by the conventional airmail

Scientific paper

10.1143/JPSJ.65.782

In this paper we analytically study the effects of the lattice discreteness on the electron band in the SSH model. We propose a modified version of the TLM model which is derived from the SSH model using a continuum approximation. When a soliton is induced in the electron-lattice system, the electron scattering states both at the bottom of the valence band and the top of the conduction band are attracted to the soliton. This attractive force induces weakly localized electronic states at the band edges. Using the modified version of the TLM model, we have succeeded in obtaining analytical solutions of the weakly localized states and the extended states near the bottom of the valence band and the top of the conduction band. This band structure does not modify the order parameters. Our result coincides well with numerical simulation works.

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