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arXiv 2602.13828cond-mat.mes-hall
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量子点链中短程相互作用及侧耦合缺陷情况下无序对激子转移的影响

Influence of Disorder on Exciton Transfer in a Quantum Dot Chain with Short-Range Interaction and a Side-Coupled Defect

Voronezh State University(沃罗涅日国立大学)

Aleksey Vlasov, Pavel Golovinski

AI总结:

研究量子点链中短程相互作用及侧耦合缺陷情况下无序对激子转移的影响,通过模型哈密顿量分析激发动力学及相变边界。

摘要:

本文考虑了在具有侧缺陷的量子点链中激子的传播。该配置适合通过侧缺陷用脉冲光学辐射对系统进行空间选择性激发。链中激发的动力学由结构无序引起,这是由于量子点自身参数和技术变化及其相互排列造成的。为了描述量子点链中激子的量子特性,使用了模型哈密顿量,考虑了由于偶极-偶极相互作用导致的相邻量子点之间的耦合。根据无序程度和链长计算了稳态态的局域化。引入了一个标准,确定从局域化到非局域化激发相的相变边界。根据激光脉冲线性激发系统,计算了量子点链中激子转移的动力学,取决于其长度和无序程度。证明了系统中出现的动态局域化对应于具有侧缺陷的链中稳态局域化性质。

英文摘要:

This paper considers the propagation of excitons in linear chains of QDs with a side defect, located on a dielectric substrate. This configuration is suitable for spatially selective excitation of the system by pulsed optical radiation through the side defect. The dynamics of excitation in the chain is governed by structural disorder, caused by technological variations in the parameters of the QDs themselves and their mutual arrangement. To describe the quantum properties of excitons in the QD chain, a model Hamiltonian is used, taking into account the coupling of neighboring QDs due to dipole-dipole interaction. The localization of stationary states is calculated depending on the magnitude of disorder and the chain length. A criterion is introduced that determines the boundaries of the phase transition from the localized to the delocalized excitation phase. The dynamics of exciton transfer along the QD chain is calculated depending on its length and degree of disorder for linear excitation of the system by a laser pulse. It is shown that dynamic localization emerging in the system corresponds to the stationary localization properties of the states of the chain with a side defect.

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。

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