Photogeneration Dynamics of a Soliton Pair in Polyacetylene

Dynamical process of the formation of a soliton pair from a photogenerated electron-hole pair in polyacetylene is studied numerically by adopting the SSH Hamiltonian. A weak local disorder is introduced in order to trigger the formation. Starting from an initial configuration with an electron at the bottom of the conduction band and a hole at the top of the valence band, separated by the Peierls gap, the time dependent Schr${\rm \ddot{o}}$ndinger equation for the electron wave functions and the equation of motion for the lattice displacements are solved numerically. After several uniform oscillations of the lattice system at the early stage, a large distortion corresponding to a pair of a soliton and an anti-soliton develops from a point which is determined by the location and type of the disorder. In some cases, two solitons run in opposite directions, leaving breather like oscillations behind, and in other cases they form a bound state emitting acoustic lattice vibrational modes.Comment: 16 pages 7 figure

COMMENSURABILITY ENERGY IN A ONE DIMENSIONAL QUARTER-FILLED ELECTRON-PHONON SYSTEM(THEORIES ON CDW NONLINEAR DYNAMICS, International Symposium on NONLINEAR TRANSPORT AND RELATED PHENOMENA IN INORGANIC QUASI ONE DIMENSIONAL CONDUCTORS)

この論文は国立情報学研究所の電子図書館事業により電子化されました。The commensurability energy of a one dimensional quarter-filled electron-phonon system is evaluated by calculating the total energy as a function of the phase φ of the fundamental (2k_F) order parameter in the case where φ is uniformly changing. The role of the higher harmonic (4k_F) order parameter is also discussed