Band to correlated crossover in alternating Hubbard and Pariser-Parr-Pople chains: Nature of the lowest singlet excitation of conjugated polymers
Data(s) |
06/09/1993
|
---|---|
Resumo |
The evolution with increasing Coulomb correlations of a semiconductor to a magnetic insulator is related to an excited-state crossover in pi-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 integral t(1 +/- delta) are based on exact results at delta=0 and 1, on molecular exciton theory at large delta, and on oligomer calculations up to twelve sites. |
Formato |
application/pdf |
Identificador |
http://eprints.iisc.ernet.in/35341/2/Band.pdf Soos, ZG and Ramasesha, S and Galvão, DS (1993) Band to correlated crossover in alternating Hubbard and Pariser-Parr-Pople chains: Nature of the lowest singlet excitation of conjugated polymers. In: Physical Review Letters, 71 (10). pp. 1609-1612. |
Publicador |
The American Physical Society |
Relação |
http://prl.aps.org/abstract/PRL/v71/i10/p1609_1 http://eprints.iisc.ernet.in/35341/ |
Palavras-Chave | #Solid State & Structural Chemistry Unit |
Tipo |
Journal Article PeerReviewed |