Affordable Access

deepdyve-link
Publisher Website

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

Authors
  • Yeh, Shu-Hao
  • Zhu, Jing
  • Kais, Sabre
Type
Published Article
Journal
The Journal of Chemical Physics
Publisher
AIP Publishing
Publication Date
Aug 28, 2012
Volume
137
Issue
8
Pages
84110–84110
Identifiers
DOI: 10.1063/1.4747622
PMID: 22938221
Source
Medline
License
Unknown

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.

Report this publication

Statistics

Seen <100 times