3665 2019 2019 eng 1206 1211 6 10 article 0 2020-02-24 -- -- 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. The Journal of Physical Chemistry (JPC) 10.1021/acs.jpclett.9b00242 1948-7185 false true © Alle Rechte vorbehalten Hong-Guang Duan Peter Nalbach R. J. Dwayne Miller Michael Thorwart Wirtschaft und Informationstechnik Bocholt Westfälische Hochschule Gelsenkirchen Bocholt Recklinghausen