Intraband dynamics and exciton trapping in the LH2 complex of Rhodopseudomonas acidophila

Erling Thyrhaug, Marco Schröter, Eglė Bukartė, Oliver Kühn, Richard Cogdell, Jürgen Hauer, Donatas Zigmantas

Research output: Contribution to journalArticlepeer-review


Over the last several decades, the light-harvesting protein complexes of purple bacteria have been among the most popular model systems for energy transport in excitonic systems in the weak and intermediate intermolecular coupling regime. Despite this extensive body of scientific work, significant questions regarding the excitonic states and the photo-induced dynamics remain. Here, we address the low-temperature electronic structure and excitation dynamics in the light-harvesting complex 2 of Rhodopseudomonas acidophila by two-dimensional electronic spectroscopy. We find that, although at cryogenic temperature energy relaxation is very rapid, exciton mobility is limited over a significant range of excitation energies. This points to the presence of a sub-200 fs, spatially local energy-relaxation mechanism and suggests that local trapping might contribute substantially more in cryogenic experiments than under physiological conditions where the thermal energy is comparable to or larger than the static disorder.

Original languageEnglish
Article number045102
JournalJournal of Chemical Physics
Issue number4
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Physical Chemistry
  • Atom and Molecular Physics and Optics


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