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29 March 2024 |
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Article overview
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Dynamics of a Chlorophyll Dimer in Collective and Local Thermal Environments | M. Merkli
; G.P. Berman
; R.T. Sayre
; S. Gnanakaran
; M. Könenberg
; A.I. Nesterov
; H. Song
; | Date: |
14 Dec 2015 | Abstract: | We present a theoretical analysis of exciton transfer and decoherence effects
in a photosynthetic dimer interacting with collective (correlated) and local
(uncorrelated) protein-solvent environments. Our approach is based on the
framework of the spin-boson model. We derive explicitly the thermal relaxation
and decoherence rates of the exciton transfer process, valid for arbitrary
temperatures and for arbitrary (in particular, large) interaction constants
between the dimer and the environments. We establish a generalization of the
Marcus formula, giving reaction rates for dimer levels possibly individually
and asymmetrically coupled to environments. We identify rigorously parameter
regimes for the validity of the generalized Marcus formula.
The existence of long living quantum coherences at ambient temperatures
emerges naturally from our approach. | Source: | arXiv, 1512.8810 | Services: | Forum | Review | PDF | Favorites |
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