2M-WS2的各向异性拉曼散射与晶格取向识别

IF 9.1 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Sabin Gautam, Sougata Mardanya, Joseph McBride, A K M Manjur Hossain, Qian Yang, Wenyong Wang, John Ackerman, Brian M. Leonard, Sugata Chowdhury, Jifa Tian
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引用次数: 0

摘要

具有低对称性的各向异性材料在下一代电子和量子器件中具有重要的前景。作为拓扑超导的候选材料,2M-WS2已经引起了人们的极大兴趣。然而,全面了解其各向异性特征是如何促成非常规超导性的,以及一种简单、可靠的方法来确定其晶体取向,仍然是难以捉摸的。在这里,我们结合理论和实验方法研究了2M-WS2的角度和偏振相关的各向异性拉曼模式。通过第一性原理计算,我们预测和分析了2M-WS2中所有拉曼模式的声子色散和晶格振动。我们建立了它们的各向异性拉曼光谱与高分辨率透射电子显微镜图像之间的直接关联。最后,我们证明了各向异性拉曼光谱可以准确地确定两个堆叠的2M-WS2层之间的晶体取向和扭曲角。我们的发现提供了对2M-WS2的电子-声子耦合和各向异性特性的见解,为各向异性材料在先进电子和量子器件中的应用铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Anisotropic Raman Scattering and Lattice Orientation Identification of 2M-WS2

Anisotropic Raman Scattering and Lattice Orientation Identification of 2M-WS2
Anisotropic materials with low symmetries hold significant promise for next-generation electronic and quantum devices. 2M-WS2, which is a candidate for topological superconductivity, has garnered considerable interest. However, a comprehensive understanding of how its anisotropic features contribute to unconventional superconductivity, along with a simple, reliable method to identify its crystal orientation, remains elusive. Here, we combine theoretical and experimental approaches to investigate angle- and polarization-dependent anisotropic Raman modes of 2M-WS2. Through first-principles calculations, we predict and analyze the phonon dispersion and lattice vibrations of all Raman modes in 2M-WS2. We establish a direct correlation between their anisotropic Raman spectra and high-resolution transmission electron microscopy images. Finally, we demonstrate that anisotropic Raman spectroscopy can accurately determine the crystal orientation and twist angle between two stacked 2M-WS2 layers. Our findings provide insights into the electron–phonon coupling and anisotropic properties of 2M-WS2, paving the way for the use of anisotropic materials in advanced electronic and quantum devices.
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来源期刊
Nano Letters
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.
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