On improving the performance of nonphotochemical quenching in CP29 light-harvesting antenna complex

Berman, G. P.; Nesterov, Alexander I.; Sayre, Richard T.; Still, Susanne

doi:10.1016/j.physleta.2016.01.052

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…[37][38][39][40][41][42] Possible relation between quantum coherence, environmental effects and non-photochemical quenching was studied recently within the single-exciton limit. [43][44][45] Within the model presented here, increased solar illumination corresponds to an increase in exciton injection, i.e. in γ inj .…”

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Environment-Assisted Quantum Photo-Protection in Interacting Multi-Exciton Transfer Complexes

Zerah-Harush,

Dubi

2019

Preprint

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Transport of excitons through transfer networks is a unique example where the interplay between quantum coherence and environment-induced dephasing leads to nontrivial effects. One exciting example is the environment-assisted quantum transport, (ENAQT), where, counter intuitively, the environment interrupts quantum transport in a way that enhances the transfer efficiency. Here we show that the interplay between dephasing and quantum coherence can lead to an additional function in exciton transport -photo-protection, that is the reduction of current upon increased excitation. We start by demonstrating that even under weak coupling conditions, weak excitations can lead to multiple-exciton generation, thus going beyond the common single-exciton approximation. We then consider the transport of two excitons, and show that a interplay between dephasing and exciton-exciton interactions leads to a reduction in current, i.e.to photo-protection. The effect may be related to actual photo-protection observed in photosynthetic systems.

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confidence: 99%

Environment-Assisted Quantum Photo-Protection in Interacting Multi-Exciton Transfer Complexes

Zerah-Harush,

Dubi

2019

Preprint

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Possible role of interference, protein noise, and sink effects in nonphotochemical quenching in photosynthetic complexes

Berman¹,

Nesterov²,

Gurvitz³

et al. 2016

J. Math. Biol.

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Abstract. We describe a simple and consistent quantum mathematical model that simulates the possible role of quantum interference and sink effects in the nonphotochemical quenching (NPQ) in light-harvesting complexes (LHCs). Our model consists of a network of five interconnected sites (excitonic states) responsible for the NPQ mechanism: (i) Two excited states of chlorophyll molecules, ChlA * and ChlB * , forming an LHC dimer, which is initially populated; (ii) A "damaging" site which is responsible for production of singlet oxygen and other destructive outcomes; (iii) The (ChlA − Zea) * heterodimer excited state (Zea indicates zeaxanthin); and (iv) The charge transfer state of this heterodimer, (ChlA − − Zea + ) * . In our model, both damaging and charge transfer states are described by discrete electron energy levels attached to their sinks, that mimic the continuum part of electron energy spectrum, as at these sites the electron participates in quasi-irreversible chemical reactions. All Possible Role of Interference and Sink Effects . . . 2 five excitonic sites interact with the protein environment that is modeled using a stochastic approach. As an example, we apply our model to demonstrate possible contributions of quantum interference and sink effects in the NPQ mechanism in the CP29 minor LHC. Our numerical results on the quantum dynamics of the reduced density matrix, demonstrate a possible way to significantly suppress, under some conditions, the damaging channel using quantum interference effects and sinks. The results demonstrate the possible role of interference and sink effects for modeling, engineering, and optimizing the performance of the NPQ processes in both natural and artificial light-harvesting complexes.

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The Carnot efficiency enabled by complete degeneracies

Zhang

et al. 2018

Physics Letters A

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On improving the performance of nonphotochemical quenching in CP29 light-harvesting antenna complex

Cited by 3 publications

References 30 publications

Environment-Assisted Quantum Photo-Protection in Interacting Multi-Exciton Transfer Complexes

Environment-Assisted Quantum Photo-Protection in Interacting Multi-Exciton Transfer Complexes

Possible role of interference, protein noise, and sink effects in nonphotochemical quenching in photosynthetic complexes

The Carnot efficiency enabled by complete degeneracies

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