LAUSR

Abstract The numbers of Weyl nodes and the separations between them have essential importance in determining the topological properties of Weyl semimetal. Weyl semimetal state has recently been observed in noncentrosymmetric transition metal dichalcogenides. However, most discovered Weyl semimetal materials possess a substantial number of Weyl points (NWP), which give rise to the complication of transport properties. Here, we propose a tunable Weyl semimetal state in substitutional disordered alloys MoTe2-xSx (x = 0.25). We theoretically show that the NWP varies with the substitutional position of S and find the interesting alloying structure with the minimum NWP by employing first-principles and Wannier-based tight-binding method. In addition, the energies, separation distance of Weyl points and NWP can be changed as a function of shear and axial strain in a given configuration, thus tuning the topological strength. Our findings provide a route to realize the controllability of topological electronic properties.