DYNAMICS OF SOLITONS IN POLYACETYLENE WITH INTERCHAIN COUPLING

The interchain charge transfer and interactions of two chains are stud ied numerically through the dynamics of charged and neutral solitons i n the presence of an electric field by using the Su-Schrieffer-Heeger model. The electric field is introduced in terms of a time-dependent v ector potential which is included in the Hamiltonian through a Peierls substitution of the phase factor to the transfer integral. The effect s of confinement on the soliton motion are determined. In particular, the viability of a single moving soliton to cross an interacting regio n between two parallel chains is analyzed, and its relationship to sol iton velocity and interaction region extent is determined. The interch ain charge-transfer probability is considered. The charge-transfer pro bability in a collision between a charged and a neutral soliton belong ing to neighboring chains is determined. It is shown that a pair of so litons, one on each chain, can move freely together in an oscillatory way, without any confinement. The oscillation frequency is estimated a nd its relationship to experimental data is clarified.