Exciton dynamics of chlorosomal light harvesting complex probed by two-dimensional electronic spectroscopy

초록

Photosynthetic light harvesting complexes and their energy transfer dynamics have attracted much interest due to their potential applications in solar cells. From recent spectroscopic studies of natural light harvesting complexes, it was proposed that quantum coherence formed among a manifold of exciton states might play an important role in highly efficient energy transfer involved in photosynthesis, stimulating intense studies in the emerging field of quantum biology [1]. Chlorosome is the most efficient photosynthetic light-harvesting system and consists of many bateriochlorophylls (BChls) in aggregates forming multiple lamellar layers, without any protein involved. Considering the unique supramolecular structure of chlorosome, it would be of much interest to examine how energy transfer occurs in chlorosome, especially in comparison with other types of natural photosynthetic complexes. In this work, we investigate the dynamics of energy transfer and role of quantum coherence in chlorosome from Chl. Phaeobacteroides using two–dimensional (2D) electronic spectroscopy at cryogenic temperature.