National Laboratory of Solid State Microstructures, School of Physics , Nanjing University , Nanjing 210093 , China.
National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering , Nanjing University , Nanjing 210093 , China.
Nano Lett. 2018 Oct 10;18(10):6585-6590. doi: 10.1021/acs.nanolett.8b03180. Epub 2018 Sep 20.
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 WTe and discover the superconducting state in K WTe through 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 WTe still hosts the topological nontrivial state. These results indicate that the K-intercalated WTe may be a promising candidate to explore the topological superconductor.
实现拓扑超导体是最吸引人的课题之一，因为它在量子计算中有很大的潜力。在这项研究中，我们成功地将钾（K）插入到第二类 Weyl 半金属 WTe 的范德瓦尔斯间隙中，并通过电输运和扫描隧道谱测量发现 K WTe 中的超导态。超导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电阻状态的共存。结构分析证实了插层引起的晶格膨胀可忽略不计，因此表明 K 插层 WTe 仍然具有拓扑非平凡态。这些结果表明，K 插层 WTe 可能是探索拓扑超导体的有前途的候选材料。
