论文标题
Kagome Metal GDV $ {_ 6} $ SN $ {_ 6} $中的可调拓扑表面状态和Van Hove奇异性
Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV${_6}$Sn${_6}$
论文作者
论文摘要
范霍夫填充的基于过渡金属的kagome材料是研究新型拓扑电子状态和相关现象的丰富边界。迄今为止，在理想化的二维kagome晶格中，尚未明确观察到拓扑非平凡的狄拉克表面状态（TDSSS），并且对TDSSS和Van Hove奇异性（VHSS）的操纵仍然很大程度上没有探索。在这里，我们揭示了来自Z $ {_ 2} $散装拓扑的TDSSS，并在Fermi级别（$ \ textit {e} $$ {_ f} $）附近识别多个VHSS中的多个VHSS中的磁性kagome材料gdv $ {_ 6} $ {_ 6} $ sn $ {_ 6} $。使用原位表面钾沉积，我们成功地实现了对TDSSS和VHSS的操纵。 TDSSS的狄拉克点可以从上方到下方调谐（$ \ textit {e} $$ {_ f} $），该{_ f} $）逆转了费米表面的自旋纹理的手性。这些结果建立了GDV $ {_ 6} $ sn $ {_ 6} $，作为研究Kagome Lattices本质的非平凡拓扑，磁性和相关效应的迷人平台。他们还建议基于kagome材料的自旋设备的潜在应用。
Transition-metal-based kagome materials at van Hove filling are a rich frontier for the investigation of novel topological electronic states and correlated phenomena. To date, in the idealized two-dimensional kagome lattice, topologically nontrivial Dirac surface states (TDSSs) have not been unambiguously observed, and the manipulation of TDSSs and van Hove singularities (VHSs) remains largely unexplored. Here, we reveal TDSSs originating from a Z${_2}$ bulk topology and identify multiple VHSs near the Fermi level ($\textit{E}$${_F}$) in magnetic kagome material GdV${_6}$Sn${_6}$. Using in-situ surface potassium deposition, we successfully realize manipulation of the TDSSs and VHSs. The Dirac point of the TDSSs can be tuned from above to below ($\textit{E}$${_F}$), which reverses the chirality of the spin texture at the Fermi surface. These results establish GdV${_6}$Sn${_6}$ as a fascinating platform for studying the nontrivial topology, magnetism and correlation effects native to kagome lattices. They also suggest potential application of spintronic devices based on kagome materials.
