Superconductivity in Potassium-Intercalated T-d-WTe2
Superconductivity in Potassium-Intercalated T-d-WTe2
复制标题
钾插层 T-d-WTe2 的超导性
DOI：
10.1021/acs.nanolett.8b03180
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发表时间：
2018
期刊：
影响因子：
10.8
通讯作者：
Li Shao-Chun
中科院分区：
文献类型：
--
作者：
Zhu Li;Li Qi-Yuan;Lv Yang-Yang;Li Shichao;Zhu Xin-Yang;Jia Zhen-Yu;Chen Y. B.;Wen Jinsheng;Li Shao-Chun
由于其在量子计算中的巨大潜力，实现拓扑超导体是最吸引人的话题之一。在本研究中，我们成功地将钾(K)嵌入到第二类Weyl半金属WTe2的范德华带隙中，并通过电输运和扫描隧道谱测量发现了KxWTe2中的超导态。超导电性表现出明显的各向异性行为。此外，我们还发现了超导和正磁阻态的共存。结构分析证实了插层引起的晶格膨胀可以忽略不计，从而表明K插层的WTe2仍然具有拓扑非平凡状态。这些结果表明，K-插层WTe2可能是探索拓扑超导体的一个有前途的候选材料。
To realize a topological superconductor is one of the most attracting topics because of its great potential in quantum computation. In this study, we successfully intercalate potassium (K) into the van der Waals gap of type II Weyl semimetal WTe2and discover the superconducting state in KxWTe2through both electrical transport and scanning tunneling spectroscopy measurements. The superconductivity exhibits an evident anisotropic behavior. Moreover, we also uncover the coexistence of superconductivity and the positive magnetoresistance state. Structural analysis substantiates the negligible lattice expansion induced by the intercalation, therefore suggesting K-intercalated WTe2still hosts the topological nontrivial state. These results indicate that the K-intercalated WTe2may be a promising candidate to explore the topological superconductor.