Nontrivial superconductivity in topological MoTe_2−xS_x crystals

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 (MoTe₂−_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 MoTe₂−_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 MoTe₂−_xS_x is not only a promising topological superconductor candidate but also a unique material for study of s₊− superconductivity.