论文标题
使用超快电子衍射在1T-TASETE在1T-TASETE中引起的电子晶格的同时探测电子晶格诱导的探测
Concurrent probing of electron-lattice dephasing induced by photoexcitation in 1T-TaSeTe using ultrafast electron diffraction
论文作者
论文摘要
在技术上，在非平衡过程中同时探测材料中的电子和晶格在技术上具有挑战性，从而确定它们的相关性。在这里，在一组在电荷密度波（CDW）材料上采取的超快电子衍射模式中，我们发现了衍射强度测量值的时间移动，这是散射角的函数。在动态模型和理论计算的帮助下，我们表明超快电子探测了价电子和晶格动态过程，从而导致时间移位测量值。我们的结果明确表明，CDW不仅是1T tasete中定期晶格变形的结果，而且具有显着的电子起源。该方法展示了一种新的方法，用于研究下一代设备的分子和晶体中电子晶格引起的许多量子效应。
It has been technically challenging to concurrently probe the electrons and the lattices in materials during non-equilibrium processes, allowing their correlations to be determined. Here, in a single set of ultrafast electron diffraction patterns taken on the charge-density-wave (CDW) material 1T-TaSeTe, we discover a temporal shift in the diffraction intensity measurements as a function of scattering angle. With the help of dynamic models and theoretical calculations, we show that the ultrafast electrons probe both the valence-electron and lattice dynamic processes, resulting in the temporal shift measurements. Our results demonstrate unambiguously that the CDW is not merely a result of the periodic lattice deformation ever-present in 1T-TaSeTe but has significant electronic origin. This method demonstrates a novel approach for studying many quantum effects that arise from electron-lattice dephasing in molecules and crystals for next-generation devices.
