单层 WSe2 中特定元素的超快晶格动力学

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-10-21 DOI:10.1021/acs.nanolett.4c03611

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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Element-Specific Ultrafast Lattice Dynamics in Monolayer WSe2

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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.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

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: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.