Electro-absorption of silicene and bilayer graphene quantum dots

摘要: We study numerically the optical properties of low-buckled silicene and AB-stacked bilayer graphene quantum dots subjected to an external electric field, which is normal their surface. Within tight-binding model, absorption calculated for dots, triangular hexagonal shapes, with zigzag armchair edge terminations. show that in clusters edges a rich widely tunable infrared peak structure originates from transitions involving zero energy states. The undergoes red shift field clusters, whereas blue takes place ones. In small blue/red triangular/hexagonal geometry. both cluster while inherent shapes dots.