First-principles prediction of superconducting properties of monolayer 1T'-WS under biaxial tensile strain.

High-purity 1T'-WS film has been experimentally synthesized [, , 1113-1120 (2021)] and theoretically predicted to be a two-dimensional (2D) superconducting material with Dirac cones [:2301.11425]. In the present work, we further study the superconducting properties of monolayer 1T'-WS by applying biaxial tensile strain. It is shown that the superconducting critical temperature firstly increases and then decreases with respect to tensile strains, with the highest superconducting critical temperature of 7.25 K under the biaxial tensile strain of 3%. In particular, we find that Dirac cones also exist in several tensile strained cases. Our studies show that monolayer 1T'-WS may provide a good platform for understanding the superconductivity of 2D Dirac materials.