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Excitonic energy transfer in light-harvesting complexes in purple bacteria

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Excitonic energy transfer in light-harvesting complexes in purple bacteria
นักวิจัย : Ye, Jun , Sun, Kewei , Zhao, Yang , Yu, Yunjin , Lee, Chee Kong , Cao, Jianshu
คำค้น : -
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2555
อ้างอิง : Ye, J., Sun, K., Zhao, Y., Yu, Y., Lee, C. K., & Cao, J. (2012). Excitonic Energy Transfer in Light-Harvesting Complexes in Purple Bacteria. Journal of Chemical Physics, 136(24), 245104-. , http://hdl.handle.net/10220/8289 , http://dx.doi.org/10.1063/1.4729786 , 167147
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of chemical physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Two distinct approaches, the Frenkel-Dirac time-dependent variation and the Haken-Strobl model, are adopted to study energy transfer dynamics in single-ring and double-ring lightharvesting systems in purple bacteria. It is found that inclusion of long-range dipolar interactions in the two methods results in significant increases in intra- or inter-ring exciton transfer efficiency. The dependence of exciton transfer efficiency on trapping positions on single rings of LH2 (B850) and LH1 is similar to that in toy models with nearest-neighbor coupling only. However, owing to the symmetry breaking caused by the dimerization of BChls and dipolar couplings, such dependence has been largely suppressed. In the studies of coupled-ring systems, both methods reveal interesting role of dipolar interaction in increasing energy transfer efficiency by introducing multiple intra/inter-ring transfer paths. Importantly, the time scale ( 4ps) of inter-ring exciton transfer obtained from polaron dynamics is in good agreement with previous studies. In a double-ring LH2 system, non-nearest neighbor interaction can induce symmetry breaking which leads to global minima and local minima of the average trapping time when there is a finite value of non-zero dephasing rate, suggesting that environment plays a role in preserving quantum coherent energy transfer. In contrast, dephasing comes into play only when the perfect cylindrical symmetry in the hypothetic system is broken. This study has revealed that dipolar interaction between chromophores may play an important part in the high energy transfer efficiency in the LH2 system and many other natural photosynthetic systems.

บรรณานุกรม :
Ye, Jun , Sun, Kewei , Zhao, Yang , Yu, Yunjin , Lee, Chee Kong , Cao, Jianshu . (2555). Excitonic energy transfer in light-harvesting complexes in purple bacteria.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ye, Jun , Sun, Kewei , Zhao, Yang , Yu, Yunjin , Lee, Chee Kong , Cao, Jianshu . 2555. "Excitonic energy transfer in light-harvesting complexes in purple bacteria".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Ye, Jun , Sun, Kewei , Zhao, Yang , Yu, Yunjin , Lee, Chee Kong , Cao, Jianshu . "Excitonic energy transfer in light-harvesting complexes in purple bacteria."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2555. Print.
Ye, Jun , Sun, Kewei , Zhao, Yang , Yu, Yunjin , Lee, Chee Kong , Cao, Jianshu . Excitonic energy transfer in light-harvesting complexes in purple bacteria. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2555.