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Noise-assisted quantum electron transfer in photosynthetic complexes | | Alexander I. Nesterov
; Gennady P. Berman
; José Manuel Sánchez Martínez
; Richard T. Sayre
; | | Date: |
30 Apr 2013 | | Abstract: | Electron transfer (ET) between primary electron donors and acceptors is
modeled in the photosystem II reaction center (RC). Our model includes (i) two
discrete energy levels associated with donor and acceptor, interacting through
a dipole-type matrix element and (ii) two continuum manifolds of electron
energy levels ("sinks"), which interact directly with the donor and acceptor.
Namely, two discrete energy levels of the donor and acceptor are embedded in
their independent sinks through the corresponding interaction matrix elements.
We also introduce classical (external) noise which acts simultaneously on the
donor and acceptor (collective interaction). We derive a closed system of
integro-differential equations which describes the non-Markovian quantum
dynamics of the ET. A region of parameters is found in which the ET dynamics
can be simplified, and described by coupled ordinary differential equations.
Using these simplified equations, both sharp and flat redox potentials are
analyzed. We analytically and numerically obtain the characteristic parameters
that optimize the ET rates and efficiency in this system. | | Source: | arXiv, 1304.7834 | | Services: | Forum | Review | PDF | Favorites | |
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