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Type: Artigo de periódico
Title: Band To Correlated Crossover In Alternating Hubbard And Pariser-parr-pople Chains: Nature Of The Lowest Singlet Excitation Of Conjugated Polymers
Author: Soos Z.G.
Ramasesha S.
Galv D.S.
Abstract: The evolution with increasing Coulomb correlations of a semiconductor to a magnetic insulator is related to an excited-state crossover in π-electron models for conjugated polymers. We associate strong fluorescence with a lowest singlet excitation S1 that is dipole allowed, on the band side, while S1 becomes two-photon allowed on the correlated side. S1/S2 crossovers in Hubbard, Pariser-Parr-Pople, or other chains with electron-hole symmetry and alternating transfer integrals t(1±δ) are based on exact results at δ=0 and 1, on molecular exciton theory at large δ, and on oligomer calculations up to twelve sites. © 1993 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.71.1609
Date Issue: 1993
Appears in Collections:Unicamp - Artigos e Outros Documentos

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