Exciton Dephasing and Thermal Line Broadening in Molecular Aggregates

Using a model of Frenkel excitons coupled to a bath of acoustic phonons in the host medium, we study the temperature dependence of the dephasing rates and homogeneous line width in linear molecular aggregates. The model includes localization by disorder and predicts a power-law thermal scaling of th...

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Bibliographic Details
Published in:arXiv.org 2006-04
Main Authors: Heijs, D J, Malyshev, V A, Knoester, J
Format: Article
Language:English
Subjects:
Acoustic coupling
Aggregates
Excitons
Line broadening
Temperature dependence
Online Access:Get full text
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Summary:Using a model of Frenkel excitons coupled to a bath of acoustic phonons in the host medium, we study the temperature dependence of the dephasing rates and homogeneous line width in linear molecular aggregates. The model includes localization by disorder and predicts a power-law thermal scaling of the effective homogeneous line width. The theory gives excellent agreement with temperature dependent absorption and hole-burning experiments on aggregates of the dye pseudoisocyanine.
ISSN:2331-8422
DOI:10.48550/arxiv.0604130