Effect of vacancies on spin transport characteristics of zigzag WS2 nanoribbon

Abstract

We present the effect of atomic vacancies on the spin conductivity of tungstenite (WS2) nanoribbon. Analyzing band structures of selected structures revealed the metallic behavior which is a promising feature for nanoribbons of WS2. The nonlinear spin-dependent electronic transport properties in zigzag tungsten disulfide were studied systematically using density functional theory combined with non-equilibrium Green’s functions. Processing transmission spectra elucidates the effect of voltage and point vacancies on the charge transport of tungstenite nanoribbon. Element types and their positions, are found to be critical in determining the spin polarization of the current-voltage characteristics. In particular, it is found that negative differential resistance (NDR) is significantly affected by ribbon edges and geometrical symmetry of scattering region. This aligns with the results of recent studies and addresses the derived rectification behaviors.