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.
@article{arxiv.1601.04728,
title = {Superradiance at the localization-delocalization crossover in tubular chlorosomes},
author = {Rafael A. Molina and Enrique Benito-Matías and Alejandro Somoza and Lipeng Chen and Yang Zhao},
journal= {arXiv preprint arXiv:1601.04728},
year = {2016}
}