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arXiv · 2603.04097

Selective Vibronic Excitation for Coherent Energy Transport in Photosynthetic and Agrivoltaic Systems

Steve Cabrel Teguia Kouam·Theodore Goumai Vedekoi·Jean-Pierre Tchapet Njafa·Jean-Pierre Nguenang·Serge Guy Nana Engo
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Abstract

Partitioning the photonic environment into resonant and off-resonant modes provides a mechanism for dephasing suppression in photosynthetic energy transfer. Aligning the excitation spectrum with underdamped vibronic resonances in the Fenna-Matthews-Olson (FMO) complex prepares vibronically dressed states with reduced coupling to dissipative fluctuations, inducing a biexponential coherence decay: a rapid initial dephasing ({\tau}fast {\approx} 37fs) followed by persistent inter-band coherences extending beyond 1ps-a > 3x extension of the effective coherence window relative to broadband excitation ({\tau}c = 280fs). This improves forward transfer yields by 39% at 295K. PT-HOPS/SBD simulations establish that dual-band filtering at 750nm and 820nm targets vibronic resonances while bypassing dephasing-dominated noise. This enhancement is robust against static disorder ({\sigma} = 50 cm-1), with an ensemble-averaged increase of {\eta} = 0.39 {\pm} 0.04. These results identify selective vibronic excitation as a foundational design principle for coherence-assisted transport. This framework extends to symbiotic agrivoltaic systems, where organic photovoltaics function as active spectral filters to co-optimize excitonic transport alongside the photosynthetic requirements of underlying crops.

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Steve Cabrel Teguia Kouam, Theodore Goumai Vedekoi, Jean-Pierre Tchapet Njafa, Jean-Pierre Nguenang, Serge Guy Nana Engo. 2026-03-04. Selective Vibronic Excitation for Coherent Energy Transport in Photosynthetic and Agrivoltaic Systems. https://doi.org/10.1021/acs.jpclett.6c00994

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