Relaxation Processes Yielding Nonlinear Excitations in the Extended Peierls-Hubbard Model for Photoexcited MX Chains
Relaxation Processes Yielding Nonlinear Excitations in the Extended Peierls-Hubbard Model for Photoexcited MX Chains
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光激发 MX 链的扩展 Peierls-Hubbard 模型中产生非线性激发的弛豫过程
DOI：
10.1143/jpsj.66.1088
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发表时间：
1997
影响因子：
1.7
通讯作者：
K. Iwano
中科院分区：
文献类型：
--
作者：
K. Iwano
利用一维扩展Peierls-Hubbard模型研究了MX链在光激发后的弛豫过程。重点讨论了在电荷密度波（CDW）背景下产生孤子和极化子等非线性激发的过程。弛豫的方式改变了它的性质，主要取决于在现场和最近邻库仑排斥U和V的相对强度，分别对现场电子晶格相互作用S。当U或U和V都超过S时，在模型的局域极限下，孤子对态与自陷激子（STE）相比是不稳定的。然而，中性孤子对可以是最低的结构激发在中间转移的情况下，稳定的巡回的效果。对于绝热势面，均匀CDW与中性孤子对相连，而STE与带电孤子对相连。预计STE将在2020年完成一个过渡...
The relaxations occurring after photoexcitation in the MX chains are investigated, using a one-dimensional extended Peierls-Hubbard model. The special emphasis is placed on the processes in which the nonlinear excitations such as solitons and polarons are created in the background of the charge-density wave (CDW). The way of relaxations changes its nature, depending mainly on the relative strengths of the on-site and nearest-neighbor Coulombic repulsions U and V , respectively, to the on-site electron-lattice interaction S . When U or both U and V dominate over S , soliton-pair states are unstable compared with the self-trapped exciton (STE) in the localized limit of the model. However, the neutral-soliton pair can be the lowest structural excitation in intermediate-transfer cases, stabilized by the effect of itineracy. As for the adiabatic potential surfaces, the uniform CDW is connected to the neutral-soliton pair, while the STE to the charged-soliton pair. It is expected that the STE will make a transi...