Insulator-to-metal transition driven by clustering of solitons in polyacetylene
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It's believed that the simple Su-Schrieffer-Heeger Hamiltonian can not predict the insulator to metal transition of transpolyacetylene (t-PA). The soliton lattice configuration at a doping level y=6% still has a semiconductor gap. Disordered distributions of solitons close the gap, but the electronic states around the Fermi energy are localized. However, within the same framework, it is possible to show that a cluster of solitons can produce dramatic changes in the electronic structure, allowing an insulator-to-metal transition.
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Metal-insulator phase transitions, Polyacetylene and derivatives, Crystal lattices, Electronic structure, Energy gap, Fermi level, Phase transitions, Polyacetylenes, Semiconducting polymers, Semiconductor doping, Metal to insulator phase transition, Soliton clustering, Solitons
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Synthetic Metals, v. 85, n. 1-3, p. 1083-1084, 1997.
