Superradiance at the localization-delocalization crossover in tubular   chlorosomes
  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. 
Rafael A. Molina (1), Enrique Benito-Mat\'ias (1), Alejandro Somoza   (2), Lipeng Chen (2), Yang Zhao (2) ((1) Instituto de ...
physics.bio-ph quant-ph