Hyein Jung, Shuo Dong, Daniela Zahn, Thomas Vasileiadis, Helene Seiler, Robert Schneider, Steffen Michaelis de Vasconcellos, Victoria C. A. Taylor, Rudolf Bratschitsch, Ralph Ernstorfer, Yoav William Windsor
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引用次数: 0
摘要
我们利用超快电子衍射研究了单层 WSe2。我们引入了一种定量提取原子位点特异性信息的方法,提供了飞秒激发后非相干原子振动的元素特异性视图。通过 W 和 Se 振动之间的差异,我们确定了声子群非热演化的各个阶段。结合计算得出的声子色散,这种元素特异性使我们能够确定特定光学声子的长期过剩,并将这些阶段解释为特定声子群之间的能量转移过程。这些结果证明了在超快时域解析特定元素振动信息的吸引力。
Element-Specific Ultrafast Lattice Dynamics in Monolayer WSe2
We study monolayer WSe2 using ultrafast electron diffraction. We introduce an approach to quantitatively extract atomic-site-specific information, providing an element-specific view of incoherent atomic vibrations following femtosecond excitation. Via differences between W and Se vibrations, we identify stages in the nonthermal evolution of the phonon population. Combined with a calculated phonon dispersion, this element specificity enables us to identify a long-lasting overpopulation of specific optical phonons and to interpret the stages as energy transfer processes between specific phonon groups. These results demonstrate the appeal of resolving element-specific vibrational information in the ultrafast time domain.
期刊介绍:
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
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