Abstract
Abstract The interchain coupling between neighboring chains in trans-polyacetylene gives rise to a confinement potential of Wla between a pair of solitons separated by distance l, where w is estimated to be 30-3K. The effect of the confinement potential on neutral and charged solitons are studied theoretically. At low temperatures (T≤50K) the neutral solitons are localized near the edge of polyacetylene crystal, which is consistent with a recent electron-nuclear triple spin resonance experiment. On the other hand the photogenerated charged soli ton pair forms bound states due to the confinement potential. We predict that the radiative decay of highly excited bound pairs to lower excited pairs give rise to the photoluminescence at low temperatures.
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