论文标题
Kagome家族Ti6x4中的拓扑超导性和大型自旋大厅效应（x = bi，sb，pb，tl，in）
Topological superconductivity and large spin Hall effect in the kagome family Ti6X4 (X = Bi, Sb, Pb, Tl, In)
论文作者
论文摘要
由于伴随的Majorana fermions，拓扑超导体（TSC）成为研究的重点。但是，实验报告的TSC极为罕见。最近的实验报道了Kagome TSC AV $ _ {3} $ SB $ _ {5} $（A = K，RB，CS），它们表现出独特的超导性，拓扑表面状态（TSS）和Majoraana Bound状态。最近，首个基于钛的Kagome超导体CSTI $ _ {3} $ bi $ $ _ {5} $与非平凡拓扑结构成功合成为TSC。鉴于CS对CSTI $ _ {3} $ bi $ _ {5} $的电子结构几乎没有贡献，并且二进制化合物可能更容易通过密度功能理论计算来合成，我们预测五个稳定的非磁性kagome kagome kagome ti $ _ {6} $ x $ x $ x $ x $ _}具有临界温度TC = 3.8 $ - $ 5.1 K，非平凡$ \ Mathbb {z} $$ _ 2 $ band Topology和TSS接近费米级别的超级传导性。此外，在ti $ _ {6} $ x $ _ {4} $中获得了大型内在的自旋效应，这是由于强大的旋转式耦合而引起的，这是由dirac节点和节点线差引起的。这项工作为TSC和Spintronic设备提供了新的平台。
Topological superconductors (TSC) become a focus of research due to the accompanying Majorana fermions. However, the experimentally reported TSC are extremely rare. The recent experiments reported the kagome TSC AV$_{3}$Sb$_{5}$ (A=K, Rb, Cs), which exhibit unique superconductivity, topological surface states (TSS), and Majorana bound states. More recently, the first titanium-based kagome superconductor CsTi$ _{3} $Bi$ _{5} $ with nontrivial topology was successfully synthesized as a perspective TSC. Given that Cs contributes little to the electronic structures of CsTi$ _{3} $Bi$ _{5} $ and binary compounds may be easier to be synthesized, here, by density functional theory calculations, we predict five stable non-magnetic kagome compounds Ti$ _{6} $X$ _{4} $ (X = Bi, Sb, Pb, Tl, In) which exhibit superconductivity with critical temperature Tc = 3.8$ - $5.1 K, nontrivial $\mathbb{Z}$$_2$ band topology, and TSS close to the Fermi level. In addition, the large intrinsic spin Hall effect is obtained in Ti$ _{6} $X$ _{4} $, which is caused by gapped Dirac nodes and nodal lines due to a strong spin-orbit coupling. This work offers new platforms for TSC and spintronic devices.
