화학공학소재연구정보센터
Applied Surface Science, Vol.373, 45-50, 2016
Spin-polarized gapped Dirac spectrum of unsupported silicene
We study effects of the spin-orbit interaction and the atomic reconstruction of silicene on its electronic spectrum. As an example we consider unsupported silicene pulled off from Pb(111) substrate. Using first principles density functional theory we show that the inversion symmetry broken arrangement of atoms and the spin-orbit interaction generate a spin-polarized electronic spectrum with an energy gap in the Dirac cone. These findings are particularly interesting in view of the quantum anomalous and quantum valley Hall effects and should be observable in weakly interacting silicene-substrate systems. (C) 2015 Elsevier B.V. All rights reserved.