Magneto-electronic and optical properties of zigzag silicene nanoribbons.

The tight-binding model including the spin-orbit coupling (SOC) is used to study electronic and optical properties of zigzag silicene nanoribbons (ZSiNRs) in magnetic and electric fields. The SOC affects the low-energy bands and induces new selection rules leading to richer optical spectra. Except an increase in bandgaps, perpendicular magnetic field further exhibits spin-polarized Landau levels, in which electron's probability density of band-edge states distributes like a standing-wave. Landau levels could enhance the DOS and increases absorption frequency and strength. Perpendicular electric field ( F z ) increases bandgap and thus absorption frequency, but it does not change band symmetry, edge-states, and selection rules. Moreover, F z enhances the split of spin-polarized states inducing more absorption peaks. Parallel electric field ( F x ) leads to an overlap between conduction and valence bands and destroys band symmetry and Landau levels. Consequently, F x exhibits new selection rules and enriches absorption spectra. [ABSTRACT FROM AUTHOR]