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- W2034008382 abstract "Abstract Numerical and analytical studies of the dynamic, mean-field, adiabatic Su-Schrieffer-Heeger model of polyacetylene are shown to reveal the typical importance of strong, coherent anharmonicity, e.g. as “breathers”. Examples illustrated include (i) single kink dynamics, (ii) electron-hole (e-h) decay in trans-(CH)x; (iii) e-h decay in cis-(CH)x; (iv) e-h decay in linear polyynes; (v) decay of a photoexcited kink or polaron; (vi) photoexcitation in the presence of bond or site defects. Using a variety of examples we have shown that the adiabatic dynamics of the SSH electron-phonon model typically exhibits strongly coherent anharmonic excitations, e.g. “breathing” modes. We have emphasized situations, e.g. photoexcitation, in which the energy input is high. Breather generation with spallation neutrons should also be considered, as should thermal production in materials with narrower band gaps. Persistent, localized breathers will also be typical in the presence of “confinement” mechanisms –whether due to electron-phonon interactions as in cis-(CH)x (or polythiophenes, polypyrroles, poly(para) phenylenes, etc.) or 1-photon excited polyynes, or due to electron correlations, interchain coupling, strain coupling, damping,7 etc. Assessing the relevance of our results for photoinduced photoabsorption experiments12 awaits further data (for a range of materials) including: psec experiments for “mid-gap” absorption; 2-photon and luminescence studies; isotope dependence, including vibronic fine structure; sensitivity to the exciting laser energy (hot electrons and bottlenecks16); we emphasize that indirect kink and breather generation and an Urbach edge are possible from intrinsic (polarons not kinks) and extrinsic (impurities) intra-gap states without quantum fluctuations. We have also seen that bond defects in the SSH Hamiltonian can be susceptible to unusual Franck-Condon renormalizations.17 A central remaining theoretical issue is the possibility of complementary roles for strong electron correlations and nonlinear dynamics. Even for short finite polyenes, where a persuasive scenario based on elementary excited correlated states has been advocated,18 we find16 that “breathing” dynamics may play and important role." @default.
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- W2034008382 date "1985-02-01" @default.
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- W2034008382 title "Nonlinear Adiabatic Dynamics In Polyacetylene and Related Materials" @default.
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- W2034008382 doi "https://doi.org/10.1080/00268948508076190" @default.
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