Superradiance at the localization-delocalization crossover in tubular chlorosomes

7 pags., 5 figs., 1 tab.We study the effect of disorder on spectral properties of tubular chlorosomes in green sulfur bacteria Cf. aurantiacus. Employing a Frenkel-exciton Hamiltonian with diagonal and off-diagonal disorder consistent with spectral and structural studies, we analyze excitonic localization and spectral statistics of the chlorosomes. A size-dependent localization-delocalization crossover is found to occur as a function of the excitonic energy. The crossover energy region coincides with the more optically active states with maximized superradiance and is, consequently, more conducive for energy transfer. ©2016 American Physical SocietyThis work was supported in part by Spanish MINECO Project No. FIS2012-34479, CSIC Project No. I-Link0938, CAM research consortium QUITEMAD+ S2013/ICE-2801, and the Singapore National Research Foundation through the Competitive Research Programme under Project No. NRFCRP5- 2009-04.Peer Reviewe