A multi-pathway model for photosynthetic reaction center

Area of Science:

• Biophysics
• Quantum Biology
• Renewable Energy

Background:

• Charge separation in photosynthesis is crucial for energy conversion.
• Quantum coherence has theoretical potential to enhance solar cell efficiency.
• Photosystem II reaction center (PSII RC) is a natural model for charge separation.

Purpose of the Study:

• To propose a biological quantum heat engine (BQHE) model for charge separation, inspired by PSII RC.
• To investigate the impact of multiple charge-separation pathways on current and power.
• To assess the BQHE's robustness against charge recombination and environmental dephasing.

Main Methods:

• Development of a BQHE model incorporating two charge-separation pathways.
• Analysis of cross-couplings between pathways to determine their effect on charge separation.
• Exploration of noise-induced quantum coherence and its role in suppressing charge recombination.

Main Results:

• Multiple charge-separation pathways significantly increase charge separation current and power.
• The BQHE model demonstrates robustness against charge recombination and environmental dephasing.
• Noise-induced quantum coherence effectively suppresses acceptor-to-donor charge recombination.

Conclusions:

• Engineered multiple pathways in artificial solar devices can mimic nature for improved performance.
• Quantum coherence plays a vital role in enhancing efficiency and stability in biological and artificial systems.
• BQHE models offer insights into optimizing charge separation for next-generation solar energy technologies.