Electro-absorption of silicene and bilayer graphene quantum dots
Abdelsalam, H; Talaat, MH; Lukyanchuk, I; et al.Portnoi, ME; Saroka, VA
Date: 6 July 2016
Article
Journal
Journal of Applied Physics
Publisher
American Institute of Physics (AIP)
Publisher DOI
Abstract
We study numerically the optical properties of low-buckled silicene and AB-stacked bilayer graphene quantum dots with zigzag edges subjected to an external electric field, which is normal to their surface. Within the nearest-neighbor approximation of the tight-binding model the optical absorption spectrum is calculated for quantum dots ...
We study numerically the optical properties of low-buckled silicene and AB-stacked bilayer graphene quantum dots with zigzag edges subjected to an external electric field, which is normal to their surface. Within the nearest-neighbor approximation of the tight-binding model the optical absorption spectrum is calculated for quantum dots of triangular and hexagonal shapes. In triangular silicene clusters a rich and widely tunable infrared absorption peak structure originates from transitions involving zero energy states. The edge of absorption in silicene quantum dots undergoes red shift in the external electric field for triangular clusters, whereas blue shift takes place for hexagonal ones. In small clusters of bilayer graphene the edge of absorption undergoes blue/red shift for triangular/hexagonal geometry.
Physics and Astronomy
Faculty of Environment, Science and Economy
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