Coherent Excitations in Photosynthetic Systems

  • Philipp O. J. SchererEmail author
  • Sighart F. Fischer
Part of the Biological and Medical Physics, Biomedical Engineering book series (BIOMEDICAL)


Photosynthetic units of plants and bacteria consist of antenna complexes and reaction centers. Rings of closely coupled chlorophyll chromophores form the light harvesting complexes which transfer the incoming photons very efficiently and rapidly to the reaction center, where the photon energy is used to create an ion pair. In this chapter, we concentrate on the properties of strongly coupled chromophore aggregates. We discuss an exciton model for a strongly coupled dimer including internal charge transfer states and apply it to the special pair of the photosynthetic reaction center. Next, we study circular molecular aggregates, as found in the light harvesting complexes of photosynthesis. We calculate the exciton spectrum including dimerization and apply it to the light harvesting complex LHII. The influence of disorder is discussed including symmetry breaking local perturbations and periodic modulations as well as general diagonal and off-diagonal disorder.

Supplementary material

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© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Physikdepartment T38Technische Universität MünchenGarchingGermany

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