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Chinese Physics, 2007, Vol. 16(10): 3052-3058    DOI: 10.1088/1009-1963/16/10/039
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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.
Keywords:  optically active coherent exciton      transition dipole moment      orientation arrangement  
Received:  30 October 2006      Revised:  19 April 2007      Accepted manuscript online: 
PACS:  87.15.M- (Spectra of biomolecules)  
  87.14.E- (Proteins)  
  87.15.A- (Theory, modeling, and computer simulation)  
  87.15.B- (Structure of biomolecules)  
  87.50.W-  
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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