二聚体晶格上电荷振荡光诱导同步中相互作用与无规性的竞争
Competition between Interactions and Randomness in Photoinduced Synchronization of Charge Oscillations on a Dimer Lattice
摘要：
本文从相互作用和随机性之间竞争的角度研究了二聚体晶格上电子呼吸模式的出现所实现的光激发后电荷振荡的同步。我们采用了一个扩展的哈伯德模型在四分之三填充一个简单的二聚体晶格和随机数添加到所有最近的邻居网站之间的转移积分。光诱导动力学计算使用含时薛定谔方程的精确对角化方法。虽然在光激发期间和之后的随机性倾向于不同步的电荷振荡不同的债券，足够强的现场排斥$U$克服了这种影响，并抑制这些电荷振荡一段时间后，强的光激发。同步的程度进行评估，使用的序参量，这是从所有债券上的电流密度的时间曲线。对于最近邻相互作用$V$，如果$V$是弱吸引的，它通过促进电荷振荡而增加序参量。这些发现的相关性，以前报道的有机导体$κ$ -（双[亚乙基二硫代]四硫富瓦烯）$_2$铜[N（CN）$_2$ ]Br的实验和理论结果进行了讨论。
英文摘要：
The synchronization of charge oscillations after photoexcitation that has been realized through the emergence of an electronic breathing mode on dimer lattices is studied here from the viewpoint of the competition between interactions and randomness. We employ an extended Hubbard model at three-quarter filling on a simple dimer lattice and add random numbers to all transfer integrals between nearest-neighbor sites. Photoinduced dynamics are calculated using the time-dependent Schrödinger equation by the exact diagonalization method. Although the randomness tends to unsynchronize charge oscillations on different bonds during and after photoexcitation, sufficiently strong on-site repulsion $U$ overcomes this effect and synchronizes these charge oscillations some time after strong photoexcitation. The degree of synchronization is evaluated using an order parameter that is derived from the time profiles of the current densities on all bonds. As to the nearest-neighbor interaction $V$, if $V$ is weakly attractive, it increases the order parameter by facilitating the charge oscillations. The relevance of these findings to previously reported experimental and theoretical results for the organic conductor $κ$-(bis[ethylenedithio]tetrathiafulvalene)$_2$Cu[N(CN)$_2$]Br is discussed.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
