Pepe Lucie, Pouthier Vincent, Yalouz Saad
Laboratoire de Chimie Quantique, Institut de Chimie, CNRS/Université de Strasbourg, 67000 Strasbourg, France.
Institut UTINAM, Université de Franche-Comté, CNRS UMR 6213, 25030 Besançon, France.
Phys Rev E. 2024 Jan;109(1-1):014303. doi: 10.1103/PhysRevE.109.014303.
In an extended star with peripheral defects and a core occupied by a trap, it has been shown that exciton-mediated energy transport from the periphery to the core can be optimized [S. Yalouz et al., Phys. Rev. E 106, 064313 (2022)2470-004510.1103/PhysRevE.106.064313]. If the defects are judiciously chosen, then the exciton dynamics is isomorphic to that of an asymmetric chain and a speedup of the excitonic propagation is observed. Here we extend this previous work by considering that the exciton in both an extended star and an asymmetric chain is perturbed by the presence of a dephasing environment. Simulating the dynamics using a Lindblad master equation, two questions are addressed: How does the environment affect the energy transport on these two networks? and Do the two systems still behave equivalently in the presence of dephasing? Our results reveal that the timescale for the exciton dynamics strongly depends on the nature of the network. But quite surprisingly, the two networks behave similarly regarding the survival of their optimization law. In both cases, the energy transport can be improved using the same original optimal tuning of energy defects as long as the dephasing remains weak. However, for moderate or strong dephasing, the optimization law is lost due to quantum Zeno effect.
在一个具有外围缺陷且核心被陷阱占据的扩展星型结构中，研究表明激子介导的从外围到核心的能量传输可以得到优化[S. 亚卢兹等人，《物理评论E》106, 064313 (2022)2470 - 004510.1103/PhysRevE.106.064313]。如果明智地选择缺陷，那么激子动力学与不对称链的动力学同构，并且会观察到激子传播加速。在这里，我们通过考虑扩展星型结构和不对称链中的激子都受到退相干环境的影响来扩展先前的工作。使用林德布拉德主方程模拟动力学，解决了两个问题：环境如何影响这两个网络上的能量传输？以及在存在退相干的情况下这两个系统是否仍然表现等效？我们的结果表明，激子动力学的时间尺度强烈依赖于网络的性质。但非常令人惊讶的是，就其优化规律的存续而言，这两个网络表现相似。在这两种情况下，只要退相干仍然较弱，就可以使用相同的原始能量缺陷最优调谐来改善能量传输。然而，对于中等或强退相干，由于量子芝诺效应，优化规律会失效。
