论文标题
观察量子旋转大厅状态在ta $ _2 $ pd $ _3 $ te $ _5 $
Observation of quantum spin Hall states in Ta$_2$Pd$_3$Te$_5$
论文作者
论文摘要
具有量子旋转大厅（QSH）效果的二维拓扑绝缘子（2DTIS）是下一代自旋设备中的关键材料之一。迄今为止，仅在几种材料中观察到QSH效应的实验证据，因此，寻找新的2DTI是物理和材料科学的最前沿。在这里，我们报告了Van der Waals材料ta $ _2 $ pd $ _3 $ te $ _5 $的实验证据。第一原理计算表明，ta $ _2 $ pd $ _3 $ te $ _5 $的每个单层都是2DTI，具有较弱的层间交互。联合传输，角度分辨光发射光谱和扫描隧道显微镜测量确认在费米级别存在带隙，而间隙内部的拓扑边缘状态则存在。这些结果表明，ta $ _2 $ pd $ _3 $ te $ _5 $是根据QSH效果制造自旋设备的有前途的材料。
Two-dimensional topological insulators (2DTIs), which host the quantum spin Hall (QSH) effect, are one of the key materials in next-generation spintronic devices. To date, experimental evidence of the QSH effect has only been observed in a few materials, and thus, the search for new 2DTIs is at the forefront of physical and materials science. Here, we report experimental evidence of a 2DTI in the van der Waals material Ta$_2$Pd$_3$Te$_5$. First-principles calculations show that each monolayer of Ta$_2$Pd$_3$Te$_5$ is a 2DTI with weak interlayer interactions. Combined transport, angle-resolved photoemission spectroscopy, and scanning tunneling microscopy measurements confirm the existence of a band gap at the Fermi level and topological edge states inside the gap. These results demonstrate that Ta$_2$Pd$_3$Te$_5$ is a promising material for fabricating spintronic devices based on the QSH effect.
