Exciton Scattering and Localization in Branched Dendrimeric Structures
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Exciton Scattering and Localization in Branched Dendrimeric Structures
- 发表刊物：
- Nature Physics
- 摘要：
- 本文第一次提出激发子散射理论
pi-conjugated dendrimers are molecular examples of tree-like structures known in physics as Bethe lattices. Electronic excitations in these systems can be spatially delocalized or localized depending on the branching topology. Without a priori knowledge of the localization pattern, understanding photoexcitation dynamics reflected in experimental optical spectra is difficult. 'Supramolecular'-like quantum-chemical calculations quickly become intractable as the molecular size increases. Here we develop a reduced exciton-scattering (ES) model, which attributes excited states to standing waves in quasi-one-dimensional structures, assuming a quasiparticle picture of optical excitations. Direct quantum-chemical calculations of branched phenylacetylene chromophores are used to verify our model and to derive relevant parameters. Complex and non-trivial delocalization patterns of photoexcitations throughout the entire molecular tree can then be universally characterized and understood using the proposed ES method, completely bypassing 'supramolecular' calculations. This allows accurate modelling of excited-state dynamics in arbitrary branched structures.
- 合写作者：
- Wu, C.; Malinin, S.V.; Tretiak, S.; Chernyak, V.Y.
- 卷号：
- 2006,2
- 页面范围：
- 631-634
- 是否译文：
- 否
- 发表时间：
- 2006-09-29