Topological Phase Transition in 2D 1T′-WSTe

The topological phase transition between normal and topological insulators is essential in topological mechanism analysis and search for new topological materials. Herein, on the basis of the well-known monolayer 2D topological insulator 1T '-WTe2, a new 2D material 1T '-WSTe is constructed. It is a typical central inversion asymmetric 2D topological insulator. The fascinating feature of this material is that its low-energy electronic structure is very similar to the inversion broken topological phase transition point. The first-principles calculations reveal that the +/- 4% uniaxial strain can effectively turn the 2D material into topological insulator or normal insulator phases.