Tailoring plasmons excitations in α − T3 armchair nanoribbons*

We have investigated finite-width alpha-T3 nanoribbons with armchair type of edge termination and have numerically obtained their energy dispersion, electronic states, wavefunctions, dynamical polarization function, and plasmon excitations. The plasmon dispersions obtained are mainly determined by the energy bandgap which depends on the number of atomic rows across the nanoribbon. We have also investigated the Landau damping of such plasmons and their dependence on the nanoribbon geometry and resulting energy bandgap, as well as on the relative hopping parameter α of the α−T3 lattice.