Topological phase transition in 1T ' -WTe 2 zigzag 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 ' -WTe 2 armchair and zigzag edge nanoribbons under the application of an out-of-plane electric field normal to the monolayer plane. Density functional theory (DFT) -Heyd-Scuseria-Ernzerhof (HSE) and maximally localized Wannier functions (MLWFs) are utilized to determine the properties of the material, and the transport calculations are performed using non-equilibrium green's function (NEGF) method and tight binding (TB) model. By using these calculations, we have observed that 1T ' -WTe 2 changes its phase from topological insulator (TI) to trivial insulator after applying a critical electric field, E=0.216 V/Å. Moreover, the edge transport phenomena, which are observed in both nanoribbons of 1T ' -WTe 2 , can contribute to the development of low-energy, dissipationless devices, particularly for designing a topological field-effect transistor.