Ergotropy of a Photosynthetic Reaction Center

• URL: http://arxiv.org/abs/2507.04097v1
• Date: Sat, 05 Jul 2025 16:46:37 GMT
• Title: Ergotropy of a Photosynthetic Reaction Center
• Authors: Trishna Kalita, Manash Jyoti Sarmah, Javed Akhtar, Himangshu Prabal Goswami,
• Abstract summary: We theoretically analyze the Photosystem II reaction center using a quantum master equation approach.<n>The focus is on ergotropy, the maximum work extractable from a quantum state without energy loss.
• Score: 0.3374875022248865
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We theoretically analyze the Photosystem II reaction center using a quantum master equation approach, where excitonic and charge-transfer rates are computed at the Redfield and F\"orster levels with realistic spectral densities. The focus is on ergotropy, the maximum work extractable from a quantum state without energy loss. We compute the ergotropy by constructing passive states in the thermodynamic sense. Among the electron transfer pathways, those involving charge separation between $Chl_{D1}$ and $Phe_{D1}$, as well as a route passing through three sequential charge-separated states, yield higher ergotropy, suggesting greater capacity for work extraction, akin to quantum energy capacitors. A third pathway, bypassing the $Chl_{D1},Phe_{D1}$ pair, shows significantly reduced ergotropy. These differences arise from population-induced transitions between active and passive regimes. Our findings highlight how biological systems may exploit non-equilibrium population structures to optimize energy conversion, connecting quantum thermodynamic principles to biological energy harvesting.

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