Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Mater. 2019 Nov;31(48):e1904641. doi: 10.1002/adma.201904641. Epub 2019 Oct 9.
Consecutively tailoring few-layer transition metal dichalcogenides MX from 2H to T phase may realize the long-sought topological superconductivity in a single material system by incorporating superconductivity and the quantum spin Hall effect together. Here, this study demonstrates that a consecutive structural phase transition from T to 1T' to 2H polytype can be realized by increasing the Se concentration in Se-substituted MoTe thin films. More importantly, the Se-substitution is found to dramatically enhance the superconductivity of the MoTe thin film, which is interpreted as the introduction of two-band superconductivity. The chemical-constituent-induced phase transition offers a new strategy to study the s superconductivity and the possible topological superconductivity, as well as to develop phase-sensitive devices based on MX materials.
通过将超导性和量子自旋霍尔效应结合在一起，连续地从 2H 相到 T 相剪裁几层层状过渡金属二卤化物 MX，可能在单个材料系统中实现长期以来寻求的拓扑超导性。在这里，本研究表明，通过增加硒取代的 MoTe 薄膜中的硒浓度，可以实现从 T 相到 1T'相再到 2H 多型的连续结构相变。更重要的是，发现硒取代极大地增强了 MoTe 薄膜的超导性，这被解释为引入了双带超导性。化学组成诱导的相变为研究 s 超导性和可能的拓扑超导性以及开发基于 MX 材料的相敏器件提供了一种新策略。
