| Summary: | 碩士 === 國立交通大學 === 電子物理學系 === 86 === This thesis focuses on three topics on the basic physics
ofconjugated conducting polymers, which are: bipolaron-
inducedoptical nonlinearity, a new bond order parameter, and
conjugatedladder polymer with high dc conductivity. In the first
topic, wepropose a new mechanism for optical nonlinearity taking
advantageof the peculiar energy levels shift of bipolarons under
optical pumping.In the second topic, we find that the
configuration of a conjugated polymer chain is characterized by
a new bond-length orderparameter, in addition to the well-known
dimerization orderparameter. Based on this new order parameter,
we predict, in the last topic, that the simplestladder polymer,
polyacene, is a gapless semiconductor, with room temperature dc
conductivity as high as one tenth of the conductivity of copper.
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