Topological Weyl semimetals (TWSs) with pairs of Weyl points and topologically protected Fermi arc states have broadened the classification of topological phases and provide superior platform for study of topological superconductivity. Here we report the nontrivial superconductivity and topological features of sulfur-doped T_d-phase MoTe₂ with enhanced T_c compared with type-II TWS MoTe₂. It is found that T_d-phase S-doped MoTe₂ (MoTe_2−xS_x, x ∼ 0.2) is a two-band s-wave bulk superconductor (∼0.13 meV and 0.26 meV), where the superconducting behavior can be explained by the s₊₋ pairing model. Further, measurements of the quasi-particle interference (QPI) patterns and a comparison with band-structure calculations reveal the existence of Fermi arcs in MoTe_2−xS_x. More interestingly, a relatively large superconducting gap (∼1.7 meV) is detected by scanning tunneling spectroscopy on the sample surface, showing a hint of topological nontrivial superconductivity based on the pairing of Fermi arc surface states. Our work demonstrates that the T_d-phase MoTe_2−xS_x is not only a promising topological superconductor candidate but also a unique material for study of s₊₋ superconductivity.

具有成对外尔点和拓扑保护费米弧态的拓扑外尔半金属（TWS）拓宽了拓扑相的分类，并为拓扑超导性的研究提供了优越的平台。在这里，我们报告了与 II 型 TWS MoTe 2 相比_具有增强 T _{c的硫掺杂}T _d相MoTe ₂的非凡超导性和拓扑特征。结果发现，T _d相 S 掺杂 MoTe ₂ (MoTe _{2− x} S _x , x ∼ 0.2) 是双带s波体超导体 (∼0.13 meV 和 0.26 meV)，其中超导行为可以表示为由s ₊₋配对模型解释。此外，准粒子干涉（QPI）图案的测量以及与能带结构计算的比较揭示了MoTe _{2− x} S _x中费米弧的存在。更有趣的是，通过扫描隧道光谱在样品表面检测到相对较大的超导能隙（∼1.7 meV），显示出基于费米弧表面态配对的拓扑非平凡超导性的暗示。我们的工作表明，T _d相 MoTe _{2− x} S _x不仅是一种有前途的拓扑超导体候选材料，而且还是研究s ₊₋超导性的独特材料。