Hill Heather M, Rigosi Albert F, Krylyuk Sergiy, Tian Jifa, Nguyen Nhan V, Davydov Albert V, Newell David B, Walker Angela R Hight
Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Phys Rev B. 2018;98. doi: 10.1103/PhysRevB.98.165109.
Transition-metal dichalcogenides (TMDCs) have offered experimental access to quantum confinement in one dimension. In recent years, metallic TMDCs like NbSe have taken center stage with many of them exhibiting interesting temperature-dependent properties such as charge density waves and superconductivity. In this paper, we perform a comprehensive optical analysis of NbSe by utilizing Raman spectroscopy, differential reflectance contrast, and spectroscopic ellipsometry. These analyses, when coupled with Kramers-Kronig analysis, allow us to extract the dielectric functions of bulk and atomically thin NbSe and relate them to the resonant behavior of the Raman spectra.
过渡金属二硫属化物（TMDCs）为一维量子限制提供了实验途径。近年来，像NbSe这样的金属TMDCs成为了研究焦点，其中许多都展现出有趣的温度依赖特性，如电荷密度波和超导性。在本文中，我们利用拉曼光谱、差分反射对比度和光谱椭偏仪对NbSe进行了全面的光学分析。这些分析与克莱默斯-克勒尼希分析相结合，使我们能够提取块状和原子级薄NbSe的介电函数，并将它们与拉曼光谱的共振行为联系起来。
