Ultrafast Energy Transfer in Excitonically Coupled Molecules Induced by a Nonlocal Peierls Phonon

  • Molecular vibration can influence exciton transfer via either a local (intramolecular) Holstein or a nonlocal (intermolecular) Peierls mode. We show that a strong vibronic coupling to a nonlocal mode dramatically speeds up the transfer by opening an additional transfer channel. This Peierls channel is rooted in the formation of a conical intersection of the excitonic potential energy surfaces. For increasing Peierls coupling, the electronically coherent transfer for weak coupling turns into an incoherent transfer of a localized exciton through the intersection for strong coupling. The interpretation in terms of a conical intersection intuitively explains recent experiments of ultrafast energy transfer in photosynthetic and photovoltaic molecular systems.

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Author:Hong-Guang Duan, Peter Nalbach, R. J. Dwayne Miller, Michael Thorwart
DOI:https://doi.org/10.1021/acs.jpclett.9b00242
ISSN:1948-7185
Parent Title (English):The Journal of Physical Chemistry (JPC)
Document Type:Article
Language:English
Date of Publication (online):2020/02/24
Year of first Publication:2019
Publishing Institution:Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen
Release Date:2020/02/25
Volume:10
Issue:6
First Page:1206
Last Page:1211
Departments / faculties:Fachbereiche / Wirtschaft und Informationstechnik Bocholt
Licence (German):License LogoEs gilt das Urheberrechtsgesetz

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