论文标题
旋转钢制引起的频段差距为fe $ _3 $ sn $ _2 $：Weyl节点的光学签名
Spin-reorientation-induced band gap in Fe$_3$Sn$_2$: Optical signatures of Weyl nodes
论文作者
论文摘要
温度和频率依赖性红外光谱范围标识了对磁性kagome金属Fe $ _3 $ sn $ _2 $的电子特性的两种贡献：二维迪拉克费米子和密切相关的平坦带。线性分散的狄拉克带中的带间跃迁显示为两步特征以及由于内部贡献而引起的非常狭窄的drude组件。低洼的吸收特征表明具有多个van霍夫奇点的平坦带。局部电荷载体被视为drude峰转移到有限的频率。当旋转在低温下重新定位时，光谱重量被重新分布。出现了一种尖锐的模式，暗示由于自旋重新定位是系统中其他Weyl节点的迹象，因此差距开放。
Temperature- and frequency-dependent infrared spectroscopy identifies two contributions to the electronic properties of the magnetic kagome metal Fe$_3$Sn$_2$: two-dimensional Dirac fermions and strongly correlated flat bands. The interband transitions within the linearly dispersing Dirac bands appear as a two-step feature along with a very narrow Drude component due to intraband contribution. Low-lying absorption features indicate flat bands with multiple van Hove singularities. Localized charge carriers are seen as a Drude-peak shifted to finite frequencies. The spectral weight is redistributed when the spins are reoriented at low temperatures; a sharp mode appears suggesting the opening of a gap due to the spin reorientation as the sign of additional Weyl nodes in the system.
