光合捕光复合物中的超辐射跃迁
Superradiance Transition in Photosynthetic Light-Harvesting Complexes
摘要：
我们研究了Fenna-Matthews-Olson光合复合物中持久的量子相干性在室温下能量传输效率中的作用。使用有效的非厄米哈密顿量分析了由于光捕获复合物与反应中心（“汇”）的耦合而引起的激发能转移。我们表明，作为耦合到反应中心是不同的，在能量传输的最大效率是在超辐射过渡附近实现的，其特征在于隔离的有效非厄米哈密顿本征值的虚部。我们的研究结果表明，存在的水槽（它提供了一个准-连续的能量谱）是占主导地位的影响，即使在没有一个热浴的情况下发生的能量转移。这种方法允许研究有限温度的影响和任何耦合方案对反应中心的影响。此外，考虑到一个现实的电偶极子相互作用，我们表明，从反应中心到Fenna-Matthews-Olson系统的最佳距离发生在超辐射跃迁，我们表明，这是与现有的实验数据相一致。
英文摘要：
We investigate the role of long-lasting quantum coherence in the efficiency of energy transport at room temperature in Fenna-Matthews-Olson photosynthetic complexes. The excitation energy transfer due to the coupling of the light harvesting complex to the reaction center ("sink") is analyzed using an effective non-Hermitian Hamiltonian. We show that, as the coupling to the reaction center is varied, maximal efficiency in energy transport is achieved in the vicinity of the superradiance transition, characterized by a segregation of the imaginary parts of the eigenvalues of the effective non-Hermitian Hamiltonian. Our results demonstrate that the presence of the sink (which provides a quasi--continuum in the energy spectrum) is the dominant effect in the energy transfer which takes place even in absence of a thermal bath. This approach allows one to study the effects of finite temperature and the effects of any coupling scheme to the reaction center. Moreover, taking into account a realistic electric dipole interaction, we show that the optimal distance from the reaction center to the Fenna-Matthews-Olson system occurs at the superradiance transition, and we show that this is consistent with available experimental data.
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