Population and coherence dynamics in light harvesting complex II (LH2)

Shu Hao Yeh, Jing Zhu, Sabre Kais

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The electronic excitation population and coherence dynamics in the chromophores of the photosynthetic light harvesting complex 2 (LH2) B850 ring from purple bacteria (Rhodopseudomonas acidophila) have been studied theoretically at both physiological and cryogenic temperatures. Similar to the well-studied Fenna-Matthews-Olson (FMO) protein, oscillations of the excitation population and coherence in the site basis are observed in LH2 by using a scaled hierarchical equation of motion approach. However, this oscillation time (300 fs) is much shorter compared to the FMO protein (650 fs) at cryogenic temperature. Both environment and high temperature are found to enhance the propagation speed of the exciton wave packet yet they shorten the coherence time and suppress the oscillation amplitude of coherence and the population. Our calculations show that a long-lived coherence between chromophore electronic excited states can exist in such a noisy biological environment.

Original languageEnglish
Article number084110
JournalJournal of Chemical Physics
Volume137
Issue number8
DOIs
Publication statusPublished - 28 Aug 2012

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Population Dynamics
Light
Temperature
Rhodopseudomonas
Proteobacteria
cryogenic temperature
Chromophores
Cryogenics
oscillations
chromophores
Population
excitation
Proteins
proteins
Wave packets
electronics
Excited states
wave packets
bacteria
Equations of motion

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Population and coherence dynamics in light harvesting complex II (LH2). / Yeh, Shu Hao; Zhu, Jing; Kais, Sabre.

In: Journal of Chemical Physics, Vol. 137, No. 8, 084110, 28.08.2012.

Research output: Contribution to journalArticle

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