Topological phase transition in 1T'-WTe2zigzag and armchair edge nanoribbons with the applied out-of-plane electric field for application in FET.

In this paper, we demonstrate the phase transition of 1T-WTearmchair and zigzag edge nanoribbons under the application of an out-of-plane electric field normal to the monolayer plane. Density functional theory, Heyd-Scuseria-Ernzerhof and maximally localized Wannier functions are utilized to determine the properties of the material, and the transport calculations are performed using non-equilibrium green's function method and tight-binding model. By using these calculations, we have observed that 1T-WTechanges its phase from topological insulator to trivial insulator after the application of a critical electric field,= 0.216. Moreover, the edge transport phenomena, which are observed in both nanoribbons of 1T-WTe, can contribute to the development of low-energy, dissipationless devices, particularly for designing a topological field-effect transistor.