Structure-dependent wavelike energy transfer on pigment rings of individual light-harvesting-2 complexes from photosynthetic bacteria

This paper studies the transfer behavior of electronic excitations on the circular and elliptically deformed B850 rings theoretically. It shows that degree of delocalization of the electronic excitation is dependent on the kinds of measured electronically excited states and the kinds of studied structures. It finds that if initial excitation is a coherent exciton, then the elliptical deformation of the B850 ring will work against energy transfer. It depicts wavelike energy transfer persisting for several hundred femtoseconds on the circular and elliptically deformed B850 rings at cryogenic temperature and finds that under the deformation, inducing localized excitation at the site near the elliptical major axis will be in favor of energy transfer, whereas at the minor axis will work against energy transfer both visibly in wavelike region.