标题： 各向异性拉曼散射和2M-WS2的晶格取向识别 显示英文标题

标题： Anisotropic Raman scattering and lattice orientation identification of 2M-WS2

摘要： 各向异性材料具有低对称性，对于下一代电子和量子器件具有重要的前景。 2M-WS2 是一种拓扑超导性的候选材料，引起了广泛关注。 然而，对其各向异性特征如何促进非常规超导性的全面理解，以及一种简单可靠的方法来确定其晶体取向，仍然缺乏。 在这里，我们结合理论和实验方法，研究 2M-WS2 的角度和偏振依赖的各向异性拉曼模式。 通过第一性原理计算，我们预测并分析了 2M-WS2 中所有拉曼模式的声子色散和晶格振动。 我们建立了其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，我们证明各向异性拉曼光谱可以准确确定两个堆叠的 2M-WS2 层之间的晶体取向和扭转角度。 我们的研究结果为 2M-WS2 的电子-声子耦合和各向异性特性提供了见解，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。 显示英文摘要

摘要： Anisotropic materials with low symmetries hold significant promise for next-generation electronic and quantum devices. 2M-WS2, 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 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.