发表机构
Tianjin University; Tiangong University（天津大学; 天津工业大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出缺陷对诱导声子干涉的理论模型，通过Huang-Rhys因子评估干涉条纹强度，并发现可调控的类狄拉克与节线拓扑态，为超快非平衡量子现象研究提供平台。
AI 中文摘要
晶格波的相干动力学对于探索非平衡条件下电子-声子耦合的非绝热现象具有重要意义。在此，我们提出了一个由缺陷对诱导的声子干涉的理论模型，其中由于强局域电子-声子耦合，具有选择性模式的晶格波由每个缺陷独立发射。我们发现，声子干涉条纹的强度可以直接通过实验中的可测量量——Huang-Rhys因子来评估，并且干涉图案的几何形状可以通过缺陷对的内部参数来修改，包括电荷态、空间距离、能级深度和局域化强度。特别是，对于适当的内部参数，出现了几种新颖的量子态，如类狄拉克和节线拓扑态。此外，利用Huang-Rhys模型，我们模拟了当缺陷对作为色心被激发时声子干涉持续时间内的超快光学光谱，其中干涉条纹与光谱强度完美匹配，类似于锁钥图案。这些结果表明，缺陷对作为多自由度相干动力学过程的驱动力，为非平衡和超快物理中探索基本量子现象提供了理想平台。
英文摘要
The coherent dynamics of lattice waves is of significant importance for exploring the nonadiabatic phenomena of the electron-phonon coupling under nonequilibrium conditions. Here, we propose a theoretical model for phonon interference induced by a defect pair, in which lattice waves with the selective modes are launched independently by each of defects due to the strongly local electron-phonon coupling. We find that the intensities of phonon interference fringes could be directly evaluated by a measurable quantity in experiments--Huang-Rhys factor, and the geometry of interference patterns could be modified by the internal parameters of defect pair, including the charge states, spatial distance, energy-level depth and localization strength. In particular, several novel quantum states, such as the Dirac-like and nodal-line topological states are emerged for the appropriate internal parameters. Furthermore, using Huang-Rhys model, we simulate the ultrafast optical spectroscopy in the phonon interference duration when defect pairs are excited as the color centers, where interference fringes are perfectly matched by intensities of spectrum, similar to the $\textit{lock-key}$ pattern. These results show that defect pair, serving as the driven force for the coherent dynamical processes for multidegrees of freedom, offers an ideal platform to explore fundamental quantum phenomena in nonequilibrium and ultrafast physics.
