Extended Peierls-Hubbard Model for One-Dimensional N-Sites N-Electrons System.III.Lattice Relaxation after Optical Excitation in CDW
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The self-trapping of exciton in the CDW phase of one-dimensional many-electron system with short-ransed electron-tvhonon(e-r) and electron-electron(e-e) interactions is studied by a vafiational method for exciton and in the adiabaticlimit for phonons, so as to clarify its lattice relaxation after the light excitation.The adiabatic potential surface describing the relaxation process is calculatedin a wide region of four parameters characterizing the system : the transfer energyof electron T, the e-p coupling energy .5, intra- and inter-site e-e repulsive energiesU and V. It is shown that in the strong coupling case S>>2T, the exciton relaxes tometastable ground states such as an island of SDW phase, and only in the inter-mediate case Sx2T it relaxes to a luminescent state localized in the middle of theenergy-gap. These results can well explain the luminescence of Wolffram's redsalt.
- 社団法人日本物理学会の論文
- 1984-01-15
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