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26 April 2024 |
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Superradiance Transition and Nonphotochemical Quenching in Photosynthetic Complexes | | Gennady P. Berman
; Alexander I. Nesterov
; Gustavo V. López
; Richard T. Sayre
; | | Date: |
24 Apr 2015 | | Abstract: | We demonstrate numerically that superradiance could play a significant role
in nonphotochemical quenching (NPQ) in light-harvesting complexes. Our model
consists of a network of five interconnected sites (discrete excitonic states)
that are responsible for the NPQ mechanism. Damaging and charge transfer states
are linked to their sinks (independent continuum electron spectra), in which
the chemical reactions occur. The superradiance transition in the charge
transfer (or in the damaging) channel, occurs at particular electron transfer
rates from the discrete to the continuum electron spectra, and can be
characterized by a segregation of the imaginary parts of the eigenvalues of the
effective non-Hermitian Hamiltonian. All five excitonic sites interact with
their protein environment that is modeled by a random stochastic process. We
find the region of parameters in which the superradiance transition into the
charge transfer channel takes place. We demonstrate that this superradiance
transition has the capability of producing optimal NPQ performance. | | Source: | arXiv, 1504.6614 | | Services: | Forum | Review | PDF | Favorites | |
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