Nonlinear lattice-relaxation process of excitons in quasi-one-dimensional halogen-bridged mixed-valence metal complexes: Self-trapping, solitons, and polarons.
Nonlinear lattice-relaxation process of excitons in quasi-one-dimensional halogen-bridged mixed-valence metal complexes: Self-trapping, solitons, and polarons.
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准一维卤桥混合价金属配合物中激子的非线性晶格弛豫过程：自捕获、孤子和极化子。
DOI：
10.1103/physrevb.45.1605
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Nasu
中科院分区：
文献类型：
--
作者：
Suzuki;Nasu
研究了一维扩展Peierls-Hubbard模型中的自陷激子、孤子和极化子，以阐明卤素桥联混合价金属配合物中光生激子的晶格弛豫路径.该理论考虑了卤素离子在垂直于链的方向上以及在平行方向上的晶格畸变。它主要基于声子的绝热近似和电子间相互作用的平均场理论，但也通过考虑电子-空穴关联来获得激子来加强。各种非线性激发的激子弛豫相关的电位表面澄清。这一结果可以从统一的观点解释相当不同的实验，如光吸收和发光光谱，斯塔克效应，和电子自旋共振数据。光致吸收的起源被推断为极化子。
Self-trapped excitons, solitons, and polarons of a one-dimensional extended Peierls-Hubbard model are investigated, in order to clarify the lattice-relaxation paths of photogenerated excitons in halogen-bridged mixed-valence metal complexes. This theory takes into account the lattice distortion of halogen ions in a direction perpendicular to the chain, as well as in a parallel direction. It is mainly based on the adiabatic approximation for phonons and the mean-field theory for interelectronic interactions, but is also reinforced by taking into account the electron-hole correlation to obtain the exciton. Potential surfaces relevant to the relaxation of the exciton are clarified in terms of various nonlinear excitations. This result can explain rather diverse experiments from a unified point of view, such as photoabsorption and luminescence spectra, the Stark effect, and electron-spin-resonance data. The origin of the photoinduced absorption is concluded to be polarons.