Magneto-optical manifestation of bilayer silicene

Abstract

AB stacking bilayer silicene is a two-dimensional material which is predicted to be a chiral topological superconductor. In contrast to monolayer silicene and bilayer graphene, bilayer silicene hosts more complexity due to the respective buckled nature of monolayer silicene, thus leading to a mechanism of optical manifestation. Here, we investigate Landau levels and magnetooptical absorption spectrum of bilayer silicene with different stacking sequences under the application of electric and magnetic fields. It is found that the Landau levels and magnetooptical absorption spectrum of bilayer silicene are sensitive to electric fields and exhibit the distinct profiles for different stacking sequences. Especially, there is a split of absorption peaks for bilayer silicene with different stacking sequences in the longitudinal magnetooptical conductivity, facilitating the possibility of identifying the stacking sequences of bilayer silicene. The manipulation of the magnetooptical absorption spectrum in AB stacking bilayer silicene might be crucial for enhancing the understandings of these materials as well as the possible applications.