Superradiance at the localization-delocalization crossover in tubular chlorosomes

• Main Authors: Molina, Rafael A., Benito-Matías, Enrique, Somoza, Alejandro D., Chen, Lipeng, Zhao, Yang
• Other Authors: School of Materials Science & Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: Superradiance; Frenkel Excitons; DRNTU::Engineering::Materials
• Online Access: https://hdl.handle.net/10356/80441; http://hdl.handle.net/10220/46543
• Institution: Nanyang Technological University

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.