Abstract
Anisotropy pump-probe experiments have provided insights into the character of excitons formed in photosynthetic complexes. Rapid decay in the observed anisotropy is cited as evidence of the strength of coupling of the excitonic degrees of freedom to their environment. Here we show that ensemble averaging over realistic model Hamiltonians leads to a rapid decay of anisotropy to a value close to the observed asymptote, and at a rate comparable to observed decay rates, even in the absence of coupling to the environment. While coupling to the environment will clearly play a role in the dynamics of such systems, our calculations suggest that caution is needed in deducing the strength of this coupling from anisotropy experiments. We also set out to clarify the nature quantum states and processes involved in the dynamics of such systems, and the associated terminology.
Original language | English |
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Pages (from-to) | 11449-11463 |
Number of pages | 15 |
Journal | Journal of Physical Chemistry B |
Volume | 120 |
Issue number | 44 |
Early online date | 11 Oct 2016 |
DOIs | |
Publication status | Published - 10 Nov 2016 |
Research Groups and Themes
- Bristol BioDesign Institute
Keywords
- synthetic biology
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How Static Disorder Mimics Decoherence in Anisotropy Pump–Probe Experiments on Purple-Bacteria Light Harvesting Complexes
Manby, F. (Creator) & Linden, N. (Creator), University of Bristol, 6 Jan 2017
DOI: 10.5523/bris.1bhb3c1po4yfu1tsjrbez1s3ce, http://data.bris.ac.uk/data/dataset/1bhb3c1po4yfu1tsjrbez1s3ce
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Profiles
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Professor Noah Linden
- School of Mathematics - Professor of Theoretical Physics
- Applied Mathematics
- Quantum Information Theory
- Mathematical Physics
Person: Academic , Member