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# First-order Transition To A Metallic State In Polyacetylene: A Strong-coupling Polaronic Metal.

Kivelson, Heeger
Published 1985 · Physics, Medicine

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We present a theory of the first-order transition to the metallic state in polyacetylene in terms of a crossover from a lattice of charged solitons to a regular array of polaronlike distortions. The polaronic metal is shown to have a strong indirect attractive interaction, ${\mathrm{U}}^{\mathrm{*}}$\ensuremath{\simeq}-2\ensuremath{\Delta}/3, between electrons in the half-filled, narrow, polaron subband within the Peierls energy gap (${\mathrm{E}}_{\mathrm{g}}$=2\ensuremath{\Delta}).

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