Multiscale cyclic dynamics in light harvesting complex in presence of vibrations and noise

Gurvitz, S. A.; Berman, G. P.; Sayre, Richard T.

doi:10.1140/epjst/e2018-800059-9

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…Notice that recently there has been a study properly accounting for the intensity of the incoming energy (sunlight) for realistic photosynthetic systems [12]. Here, however, we focus on engineered systems for excitation transport, therefore we employ the commonly used figures of merit defined above.…”

Section: Transport Efficiency and Average Trapping Timementioning

confidence: 99%

“…The environment of the light-harvesting protein has been modeled in different ways, including random telegraph noise (RTN) [4][5][6][7][8][9][10][11][12], the Haken-Strobl-Reineker model [13][14][15][16][17] and collections of harmonic oscillators [2,3,[18][19][20][21][22][23][24]. Earlier results show that the quantum transport efficiency may be enhanced for certain values of the parameters of the noise, such as dephasing rate [19, 1, 3-5, 11, 18, 20-23], noise amplitude [6,8,9,15,16], reorganization energy [5,13,18,19,24], and noise correlations [2,7,14,17,25].…”

Section: Introductionmentioning

confidence: 99%

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Efficient quantum transport in a multi-site system combining classical noise and quantum baths

2020

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We study the population dynamics and quantum transport efficiency of a multi-site dissipative system driven by a random telegraph noise (RTN) by using a variational polaron master equation for both linear chain and ring configurations. By using two different environment descriptions-RTN only and a thermal bath+RTN-we show that the presence of the classical noise has a non-trivial role on quantum transport. We observe that there exist large areas of parameter space where the combined bath+RTN influence is clearly beneficial for populating the target state of the transport, and for average trapping time and transport efficiency when accounting for the presence of the reaction center via the use of the sink. This result holds for both of the considered intra-site coupling configurations including a chain and ring. In general, our formalism and achieved results provide a platform for engineering and characterizing efficient quantum transport in multi-site systems both for realistic environments and engineered systems.

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Section: Transport Efficiency and Average Trapping Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient quantum transport in a multi-site system combining classical noise and quantum baths

2020

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“…The mathematical modeling of exciton and electron transfer (ET) in mesoscopic and biological systems has recently attracted much attention [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In this respect, the common features of these systems are: (i) the ET takes place between donor and acceptor with finite bandwidths [2,3,[21][22][23] and (ii) the interaction between donor and acceptor bands, and the interaction of the dimer with environment should be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Modeling of noise-assisted quantum transfer between donor and acceptor with finite bandwidths

Nesterov¹,

Berman²,

Merkli³

et al. 2019

J. Phys. A: Math. Theor.

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We present an analytical and numerical study of noise-assisted quantum exciton (electron) transfer (ET) in a dimer consisting of donor and acceptor, modeled by interacting continuous electron bands of finite widths. We start with discrete energy levels for both bands. The interaction with the environment is modeled by a stationary stochastic process (noise) acting on all the donor and acceptor energy levels. Then, by using a continuous limit for the electron spectra, we derive integro-differential equations for the ET dynamics between the two bands. Finally, we derive from these equations rate-type differential equations for the ET dynamics. We formulate the conditions of validity of the rate-type equations. We consider different regions of parameters characterizing the widths of the donor and acceptor bands and the strength of the dimer-noise interaction. For a simplified model with a single energy level donor and a continuous acceptor band, we derive a generalized simple analytic expression and provide numerical simulations for the ET rate. They are consistent with Wigner-Weisskopf, Förster-type, and Marcus-type expressions, in their corresponding regime of parameters. For a weak dimer-noise interaction, our approach leads to the Wigner-Weisskopf ET rate, or to the Förster-type ET rate, depending on other parameters. In the

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“…Here, we challenge this assumption, and show that even under mild conditions (and commonly-used parameters) the single-exciton limitation is flawed, as the system has a high probability of being occupied by two excitons. Such two-exciton states may play an important role in exciton transport, 29 especially in the presence of exciton interactions, which were observed by coherent two-dimensional spectroscopic, 30 emphasizing the importance of considering them in theoretical models.…”

mentioning

confidence: 99%

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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Multiscale cyclic dynamics in light harvesting complex in presence of vibrations and noise

Cited by 4 publications

References 19 publications

Efficient quantum transport in a multi-site system combining classical noise and quantum baths

Efficient quantum transport in a multi-site system combining classical noise and quantum baths

Modeling of noise-assisted quantum transfer between donor and acceptor with finite bandwidths

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

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