论文标题
nbirte4中的语音子和电子音纸相互作用的拉曼探测器4
A Raman Probe of Phonons and Electron-phonon Interactions in NbIrTe4
论文作者
论文摘要
半学NBIRTE4已被认为是I型Weyl半学，具有8对相反的手性Weyl节点，非常接近Fermi Energy。由于NBIRTE4的反转对称性破裂，这是一种具有TD对称性的正常晶体，因此这种拓扑电子结构成为可能。使用微拉曼散射作为探针，我们观察到这种材料中19个声子模式的频率和对称性（范围为40至260 cm-1），并与密度功能理论计算进行比较。使用角度和极化解决的绿色（514 nm）和红色（633 nm）激光激发的拉曼散射，我们表明可以提取与每个可测量的声子相关的拉曼张量元件的激发能依赖性。我们表明，这些张量元件在较小的能量范围内有很大差异，这反映了这些模式的电子 - 光子耦合的强烈变化。
The semimetal NbIrTe4 has been proposed to be a Type-II Weyl semimetal with 8 pairs of opposite Chirality Weyl nodes which are very close to the Fermi energy. This topological electronic structure is made possible because of the broken inversion symmetry of NbIrTe4 which is an orthorhombic crystal with Td symmetry. Using micro-Raman scattering as a probe, we observe the frequencies and symmetries of 19 phonon modes (ranging from 40 to 260 cm-1) in this material and compare to Density Functional Theory calculations. Using angular and polarization resolved Raman scattering for green (514 nm) and red (633 nm) laser excitation, we show that it is possible to extract the excitation energy dependence of the Raman tensor elements associated with each measurable phonon mode. We show that these tensor elements vary substantially in a small energy range which reflects a strong variation of the electron-phonon coupling for these modes.
