Effects of Site-Type and Bond-Type Disorders on the Dynamics of Charged and Neutral Solitons

概要

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The effects of a site-type irnpurity potential and a bond-type disorder on the dynamical behav-iors of charged and neutral solitons in polyacetylene are studied nunaerically. The charged solitonfeels the site-type potential in the same way as an electron does, except for the broadening ofthe potential range due to the finite width of the soliton. While the neutral soliton goes throughthe site-type impurity potential as if there is nothing, reflecting the fact that the excess electrondensity vanishes everywhere in this case. On the other hand, there is no essential differencebetween the effects of the bond-type disorder on both solitons. The effective potential in thiscase looks like a step function, which can be explained in terms of matching or rnismatching ofthe disorder with the dimerization pattern in the region outside of the soliton.
社団法人日本物理学会の論文
1997-03-15