Lattice Relaxation Theory of Soliton and Polaron Generation in Polyacetylene
The lattice relaxation theory of multiphonon processes developed by Huang and Rhys  and others  in the early 50s in connection with colour centers in ionic crystals has proved to be very successful in traditional solid state physics. The key idea in this theory is explicitly to take into account the difference in the symmetry breaking (lattice relaxation) of the initial and the final states of quantum transitions involving multiphonon processes. We have shown that the lattice relaxation theory offers a natural and convenient vehicle to treat the soliton and polaron generation in polyacetylene [3–5] important for some recent development in this exciting field . We have generalized the original version of this theory to include the self-consistency of the electronic states with the lattice configuration as well as the many-electron background effects both of which are essential for the collective, self-localized excitations such as soliton and polaron. Our calculations have been published in , whereas the connection with the recent experiments has been discussed in . Since the reference  is not easily accessible, we will outline here the basic idea of the method itself which may be useful for some other purposes.
KeywordsColour Center Lattice Relaxation Nonradiative Decay Exciting Field Lattice Configuration
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