Coherent excitons at different orientation arrangements of local transition dipole moments in circular light-harvesting complexes
Chu Qian-Jin(储谦谨)†, Yin Hua-Wei(尹华伟), and Weng Yu-Xiang(翁羽翔)
Laboratory of Soft Matter Physics and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract The coherent exciton plays an important role in the photosynthetic primary process, and its functions are deeply dependent on the orientation arrangements of local transition dipole moments (TDMs). We theoretically and systematically study the physical property of the coherent exciton at different orientation arrangements of the local TDMs in circular light-harvesting (LH) complexes. Especially, if the orientation arrangements are different, the delocalized TDMs of the coherent excitons and the energy locations of the optically active coherent excitons (OACEs) can be obviously different, and then there are more manners to capture, store and transfer light energy in and between LH complexes. Similarly, if the orientation arrangements are altered, light absorption and radiative intensities can be converted fully between the OACEs in the upper and lower coherent exciton bands, and then the blue and red shifts of the absorption and radiative bands of the pigment molecules can occur simultaneously at some orientation arrangements. If the systems are in the vicinities of the critical orientation arrangements, the weak static disorder or small thermal excitation can destroy the coherent electronic excitations, and then the coherent exciton cannot exist any more.
Received: 30 October 2006
Revised: 19 April 2007
Accepted manuscript online:
Fund: Project supported by the
National Natural Science Foundation of China (Grant Nos 60438020
and 60321003), and the Knowledge innovation program of the
Chinese Academy of Sciences (Grant No KJCX2-SW-W14).
Cite this article:
Chu Qian-Jin(储谦谨), Yin Hua-Wei(尹华伟), and Weng Yu-Xiang(翁羽翔) Coherent excitons at different orientation arrangements of local transition dipole moments in circular light-harvesting complexes 2007 Chinese Physics 16 3052
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