论文标题
$ \ mathbf {v_6sb_4} $ with kagome biLayer in $ \ mathbf {v_6sb_4} $ in Symmetry Propotery dirac节点线和大型旋转大厅效应
Symmetry-protected Dirac nodal lines and large spin Hall effect in $\mathbf{V_6Sb_4}$ with kagome bilayer
论文作者
论文摘要
最近，一个非磁性kagome金属\ textit {a} $ \ mathrm {v_3sb_5} $（\ textit {a} = k，rb和cs）引起了人们的重大关注，以意识到量子订单的相互作用量子和非宗教拓扑。但是，这些化合物已被鉴定为具有复杂的带结构。因此，希望使用简单的带拓扑和良好的运输特性设计和合成新型的Kagome材料。在这项研究中，使用第一原理计算，我们介绍了V $ _6 $ SB $ _4 $的电子特性和内在的自旋效果，这是最新的实验合成的基于Kagome BiLayer的实验合成的化合物。在没有自旋轨道耦合（SOC）的情况下，该化合物是一种乳房结节线半度的，在费米水平附近具有对称性保护的节点环。在SOC中，自旋旋转对称性用小带隙打破了节点环的间隙。此外，根据Wannier紧密结合方法和Kubo公式，我们提出了V $ _6 $ SB $ _4 $中的大型自旋效果，该效果本质地源自旋转浆果曲率。我们的工作进一步扩展了非磁性kagome化合物，用于旋转型的应用，并伴有外来的量子顺序。
Recently, a family of nonmagnetic kagome metals \textit{A}$\mathrm{V_3Sb_5}$ (\textit{A}=K, Rb, and Cs) has attracted significant attention for realizing the intertwining of quantum order and nontrivial topology. However, these compounds have been identified to host complex band structures. Therefore, it is desirable to design and synthesize novel kagome materials with a simple band topology and good transport properties. In this study, using first-principles calculations, we present the electronic properties and the intrinsic spin Hall effect of V$_6$Sb$_4$, the latest experimentally synthesized vanadium-based compounds with a kagome bilayer. In the absence of spin-orbital coupling (SOC), this compound is a Dirac nodal line semimetal with symmetry-protected nodal rings near the Fermi level. Within the SOC, the spin-rotation symmetry breaks the gaps of the nodal rings with a small band gap. Furthermore, based on the Wannier tight-binding approach and the Kubo formula, we propose a large spin Hall effect in V$_6$Sb$_4$, which intrinsically originates from the spin Berry curvature. Our work further expands nonmagnetic kagome compounds for applications in spintronics accompanied by exotic quantum order.
