arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.07293cond-mat.mtrl-sci
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Ta $_2$ Pd $_3$ Te $_5$中量子自旋霍尔态的观察

Observation of quantum spin Hall states in Ta$_2$Pd$_3$Te$_5$

Xuguang Wang, Daiyu Geng, Dayu Yan, Wenqi Hu, Hexu Zhang, Shaosheng Yue, Zhenyu Sun, Shiv Kumar, Kenya Shimada, Peng Cheng, Lan Chen, Simin Nie, Zhijun Wang, Yo… 展开作者

Xuguang Wang, Daiyu Geng, Dayu Yan, Wenqi Hu, Hexu Zhang, Shaosheng Yue, Zhenyu Sun, Shiv Kumar, Kenya Shimada, Peng Cheng, Lan Chen, Simin Nie, Zhijun Wang, Youguo Shi, Yi-Qi Zhang, Kehui Wu, Baojie Feng

摘要:

二维拓扑绝缘体(2DTI)具有量子自旋霍尔(QSH)效应,是下一代自旋电子器件的关键材料之一。迄今为止,QSH效应的实验证据仅在少数材料中观察到,因此,寻找新的2DTI处于物理和材料科学的最前沿。在这里,我们报告的2DTI范德华材料Ta $_2$ Pd $_3$ Te $_5$的实验证据。第一性原理计算表明,Ta $_2$、Pd $_3$、Te $_5$的每个单层都是具有弱层间相互作用的二维弥散张量干涉.结合运输,角分辨光电子能谱,和扫描隧道显微镜测量确认的费米能级和拓扑边缘状态的间隙内的带隙的存在。这些结果表明Ta $_2$ Pd $_3$ Te $_5$是一种很有前途的用于制备基于QSH效应的自旋电子器件的材料。

英文摘要:

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.

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