论文标题
II型Weyl半养牛的光学电导率$ _4 $
Optical conductivity of the type-II Weyl semimetal TaIrTe$_4$
论文作者
论文摘要
Tairte $ _4 $是候选Weyl型II半学的一个示例，其可能数量的Weyl节点数量最少。据报道，有四个节点存在于$ k $ -space中。与Weyl节点相关的锥形分散的存在尚未通过实验显示。在这里，我们将光谱法作为低能量尺度的谱带结构的探针。研究光导率使我们能够以零动量探测内标和带间跃迁。在Tairte $ _4 $中，我们观察到狭窄的drude贡献和带的电导率，这可能与高达40 meV的倾斜线性带分散相一致。带间电导率使我们能够建立锥体分散的有效参数。有效速度$ v = 1.1 \ cdot 10^{4} $ 〜m/s和倾斜$γ= 0.37 $。传输数据，Seebeck和Hall系数在质量上与谱带结构中的锥形特征一致。定量分歧可能与Tairte $ _4 $的多播种性质有关。
TaIrTe$_4$ is an example of a candidate Weyl type-II semimetal with a minimal possible number of Weyl nodes. Four nodes are reported to exist a single plane in $k$-space. The existence of a conical dispersion linked to Weyl nodes has yet to be shown experimentally. Here we use optical spectroscopy as a probe of the band structure on a low-energy scale. Studying optical conductivity allows us to probe intraband and interband transitions with zero momentum. In TaIrTe$_4$, we observe a narrow Drude contribution and an interband conductivity that may be consistent with a tilted linear band dispersion up to 40~meV. The interband conductivity allows us to establish the effective parameters of the conical dispersion; effective velocity $v=1.1\cdot 10^{4}$~m/s and tilt $γ=0.37$. The transport data, Seebeck and Hall coefficients, are qualitatively consistent with conical features in the band structure. Quantitative disagreement may be linked to the multiband nature of TaIrTe$_4$.
