@article{43347,
  abstract     = {{The pump−probe signal from the light-harvesting antenna LH2 of purple bacteria is analyzed using a Green function expression derived by solving the nonlinear exciton-oscillator equations of motion (NEE). A microscopic definition of the exciton mean free path (Lf) and localization size (Lρ) is given in terms of the off-diagonal elements of the exciton Green function and density matrix, respectively. Using phonon-induced (homogeneous) and disorder-induced (inhomogeneous) line widths compatible with superradiane measurements, we find that at 4.2 K the localization size is Lρ = 15 and that the shift ΔΩ between the positive and negative peaks in the differential absorption is determined by a different effective size Lf/2 = 5.6 associated with the exciton mean free path. Our model further predicts the recently observed superradiance coherence size determined by Lρ.}},
  author       = {{Meier, Torsten and Chernyak, V. and Mukamel, S.}},
  journal      = {{The Journal of Physical Chemistry B}},
  number       = {{37}},
  pages        = {{7332--7342}},
  publisher    = {{American Chemical Society}},
  title        = {{{Multiple Exciton Coherence Sizes in Photosynthetic Antenna Complexes viewed by Pump-Probe Spectroscopy}}},
  doi          = {{10.1021/jp970045v}},
  volume       = {{101}},
  year         = {{1997}},
}