Vibrational Enhancement of the Effective Donor - Acceptor Coupling
M. Lazrek (Lab. Phys. Cond. Mat., Faculty of Sciences, Jarzouna, Bizerte, Tunisie), D. J. Bicout (Institut Laue-Langevin, Grenoble, France and, Biomathematics, Epidemiology, ENVL - TIMC, Marcy l'Etoile, France), S., Jaziri (Lab. Phys. Cond. Mat., Faculty of Sciences
TL;DR
This paper investigates how vibrational dynamics in a donor-bridge-acceptor system can enhance charge transfer efficiency by forming polarons, with maximum effect at resonance conditions.
Contribution
It introduces a simple three-site model showing vibrational coupling can enhance donor-acceptor coupling via polaron formation, highlighting resonance effects.
Findings
Vibrational coupling enhances donor-acceptor electronic coupling.
Maximum enhancement occurs at resonance where B site energy matches donor/acceptor.
Polaron formation on the bridge site is key to the enhancement.
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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