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arXiv 2308.08021cond-mat.mes-hall
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论“供体”/“受体”的存在对分子链中激发态的影响:非绝热极化子方法

On the influence of the "donor"/"acceptor" presence on the excitation states in molecular chains: non-adiabatic polaron approach

V. Matic, Z. Ivic, Z. Przulj, D. Chevizovich

AI总结:

本文采用非绝热极化子模型研究含“供体/受体”分子的分子链中激发的自陷与迁移,揭示供体对链上激发性质影响有限,而链会改变供体能级并间接调控迁移过程。

摘要:

在本文中,我们考虑了一种分子结构,该结构由一条分子链和一个额外分子(“供体”/“受体”)组成,后者能够向分子链注入(或从分子链移除)单个激发(振子、电子等)。我们假设,由于激发与分子链结构单元的机械振动之间存在相互作用,激发会形成自陷态。我们分析了激发的能谱,并表明当其迁移到分子链上时,其状态具有非绝热极化子态的性质。文中考察了激发能够从一个子系统迁移到另一个子系统的条件。结果表明,“供体”分子的存在并不能显著改变位于分子链上的激发的性质。与此同时,分子链能够影响局域在“供体”子系统上的激发能级的位置。这会间接地影响激发从一个子系统向另一个子系统迁移的过程。文中讨论了系统的基本能量参数和环境温度对这一过程的影响。整个系统被假设为与环境处于热平衡状态。

英文摘要:

In the paper, we considered a molecular structure that consists of a molecular chain and an additional molecule ("donor"/"acceptor") that can inject (or remove) single excitation (vibron, electron, e.t.c.) onto the molecular chain. We assumed that the excitation forms a self-trapped state due to the interaction with mechanical oscillations of chain structure elements. We analyzed the energy spectra of the excitation and showed that its state (when it migrates to the molecular chain) has the properties of the non-adiabatic polaron state. The conditions under which the excitation can migrate from one subsystem to another were considered. It was shown that the presence of a "donor" molecule cannot significantly change the properties of the excitation located on the molecular chain. At the same time, the molecular chain can affect the position of the energy level of the excitation localized on the "donor" subsystem. Indirectly, this can influence the process of excitation migration from one subsystem to another one. The influence of basic energy parameters of the system and the environment temperature on this process are discussed. The entire system was assumed to be in thermal equilibrium with the environment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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