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- W1996237303 abstract "The Pariser-Parr-Pople (PPP) method has revealed rich effects of the π electron Coulomb interaction in (CH) x . We discuss results obtained by the PPP model with the unrestricted Hartree-Fock (UHF) approximation and we show that concepts introduced by the PPP-UHF model give a new insight on Franck-Condon-type electronically excited states in (CH) x . In the first part of this paper, a brief review of the PPP-UHF model is given. We introduce phase and amplitude variables and show that solitons in the PPP-UHF model are phase excitations. In the second part of this paper, the effective Hamiltonian describing phase excitations is derived. We show that the phase Hamiltonian derived by the time-dependent Hartre-Fock approximation is the classical limit of the Hamiltonian derived by the bosonization method of Tomonaga, Luther, and others. The phase Hamiltonian has a family of new soliton solutions. These solitons are pure electronic excitations and correspond to the exciton and the magnon in (CH) x" @default.
- W1996237303 created "2016-06-24" @default.
- W1996237303 creator A5016751632 @default.
- W1996237303 date "1990-04-01" @default.
- W1996237303 modified "2023-09-27" @default.
- W1996237303 title "Nonlinear phase excitations in thePPP model of polyacetylene" @default.
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- W1996237303 doi "https://doi.org/10.1002/qua.560370424" @default.
- W1996237303 hasPublicationYear "1990" @default.
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