Phys. Rev. B 39, 5763–5766 (1989)Nonlinear lattice relaxation of photogenerated charge-transfer excitation in halogen-bridged mixed-valence metal complexes. II. Polaron channelReceived 12 July 1988; published in the issue dated 15 March 1989 The one-dimensional extended Peierls-Hubbard model with half-filled-band electrons is studied in order to clarify the lattice relaxation path of the photogenerated charge-transfer excitation in halogen-bridged mixed-valence metal complexes. The ground and excited states are calculated within mean-field theory for electrons and the adiabatic approximation for phonons. It is concluded that the main origin of the photoinduced absorption is a distant pair of the hole-polaron and the electron-polaron. This distant pair is created not from the ground state of the self-trapped exciton (STE), but from the excited states of the STE through their autodissociation. This is consistent with the experiment on the excitation energy dependence of the photoinduced absorption yield. © 1989 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.39.5763
DOI:
10.1103/PhysRevB.39.5763
PACS:
71.45.Lr, 78.20.Bh, 78.50.-w, 71.38.+i
See AlsoSee Also: A. Mishima and K. Nasu, Nonlinear lattice relaxation of photogenerated charge-transfer excitation in halogen-bridged mixed-valence metal complexes. I. Soliton and self-trapped exciton, Phys. Rev. B 39, 5758 (1989). |
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