In this research, I have investigated the transport of topological edge states in 2D hexagonal Zigzag edge Tungsten Ditelluride Nanoribbon (ZTDNR). I have found that zigzag edge nanoribbon (NR) of Tungsten Ditelluride develops topological edge states in the presence of spin orbit interaction (SOC) if we include the SOC term in the next neighbour of the model. We have used three band tight binding model for the electrons of dz2, dxy, and dx2-y2 orbitals with SOC for calculating band structure of NR and Non Equilibrium Greens Function (NEGF) formalism for transport in the NR. We have investigated transport in a pristine device, transport in the presence of a finite potential barrier, transport with constriction within the device and transport with edge imperfections.

link: https://www.researchgate.net/publication/349604117_Transport_of_Topological_Edge_States_in_2D_Zigzag_Edge_Tungsten_Ditelluride_Nanoribbon

Abstract— Electron transport properties in 2D hexagonal lattice topological insulators (TI) under photon interaction is investigated using (NEGF) and Haldane model. Back scattering less transport of electrons in valence band and conduction band (after photo-excitation) is observed. The result of this research can be utilized for designing of nanoscale optoelectronics coherent electron devices.

Index Terms— Topological Insulators, Back Scattering, NEGF, Photo excitation, Haldane model.