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VOLUME 82 | ISSUE 6 | PAGE 407
Vibrational enhancement of the effective donor -- acceptor Coupling
M. Lazrek+*, D. J. Bicout^{+\triangle}, S. Jaziri*, E. Kats^{+\square}

+Institut Laue-Langevin, BP 156, Grenoble, France
*Laboratoire de Physique de la Matière Condensée, Faculté des Sciences de Bizerte, 7021 Jarzouna Bizerte, Tunisie
^{\triangle}Biomathematics and Epidemiology, ENVL - TIMC, 69280 Marcy l'Etoile, France
^{\square}L. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia


PACS: 34.70.+e, 73.40.Gk, 82.39.Jn
Abstract
The paper deals with a simple three sites model for charge transfer phenomena in an one-dimensional donor (D)~-- bridge (B)~-- acceptor (A) system coupled with vibrational dynamics of the B site. It is found that in a certain range of parameters the vibrational coupling leads to an enhancement of the effective donor~-- acceptor electronic coupling as a result of the formation of the polaron on the B site. This enhancement of the charge transfer efficiency is maximum at the resonance, where the effective energy of the fluctuating B site coincides with the donor (acceptor) energy.


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