First-principles prediction of superconducting properties of monolayer 1T′-WS2 under biaxial tensile strain

Abstract

High-purity 1T′-WS₂ film has been experimentally synthesized [Nature Materials, 20, 1113–1120 (2021)] and theoretically predicted to be a two-dimensional (2D) superconducting material with Dirac cones [arXiv:2301.11425]. In the present work, we further study the superconducting properties of monolayer 1T′-WS₂ by applying biaxial tensile strain. It is shown that the superconducting critical temperature T_c firstly increases and then decreases with respect to tensile strains, with the highest superconducting critical temperature T_c 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′-WS₂ may provide a good platform for understanding the superconductivity of 2D Dirac materials.