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Title: Electro-absorption of silicene and bilayer graphene quantum dots

Abstract

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 to their surface. Within the tight-binding model, the optical absorption is calculated for quantum dots, of triangular and hexagonal shapes, with zigzag and armchair edge terminations. We show that in triangular silicene clusters with zigzag edges 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 with zigzag edges the edge of absorption undergoes blue/red shift for triangular/hexagonal geometry. In armchair clusters of silicene blue shift of the absorption edge takes place for both cluster shapes, while red shift is inherent for both shapes of the bilayer graphene quantum dots.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [5];  [6]
  1. Laboratory of Condensed Matter Physics, University of Picardie, Amiens 80039 (France)
  2. (Egypt)
  3. Physics Department, Faculty of Science, Ain Shams University, Cairo (Egypt)
  4. (Russian Federation)
  5. School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom)
  6. (Belarus)
Publication Date:
OSTI Identifier:
22597889
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 120; Journal Issue: 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ELECTRIC FIELDS; GEOMETRY; GRAPHENE; LAYERS; OPTICAL PROPERTIES; PEAKS; QUANTUM DOTS; RED SHIFT; SHAPE; SILICENE; SURFACES

Citation Formats

Abdelsalam, Hazem, E-mail: hazem.abdelsalam@etu.u-picardie.fr, Department of Theoretical Physics, National Research Center, Cairo 12622, Talaat, Mohamed H., Lukyanchuk, Igor, L. D. Landau Institute for Theoretical Physics, Moscow, Portnoi, M. E., Saroka, V. A., E-mail: v.saroka@exeter.ac.uk, and Institute for Nuclear Problems, Belarusian State University, Bobruiskaya 11, 220030 Minsk. Electro-absorption of silicene and bilayer graphene quantum dots. United States: N. p., 2016. Web. doi:10.1063/1.4955222.
Abdelsalam, Hazem, E-mail: hazem.abdelsalam@etu.u-picardie.fr, Department of Theoretical Physics, National Research Center, Cairo 12622, Talaat, Mohamed H., Lukyanchuk, Igor, L. D. Landau Institute for Theoretical Physics, Moscow, Portnoi, M. E., Saroka, V. A., E-mail: v.saroka@exeter.ac.uk, & Institute for Nuclear Problems, Belarusian State University, Bobruiskaya 11, 220030 Minsk. Electro-absorption of silicene and bilayer graphene quantum dots. United States. doi:10.1063/1.4955222.
Abdelsalam, Hazem, E-mail: hazem.abdelsalam@etu.u-picardie.fr, Department of Theoretical Physics, National Research Center, Cairo 12622, Talaat, Mohamed H., Lukyanchuk, Igor, L. D. Landau Institute for Theoretical Physics, Moscow, Portnoi, M. E., Saroka, V. A., E-mail: v.saroka@exeter.ac.uk, and Institute for Nuclear Problems, Belarusian State University, Bobruiskaya 11, 220030 Minsk. Thu . "Electro-absorption of silicene and bilayer graphene quantum dots". United States. doi:10.1063/1.4955222.
@article{osti_22597889,
title = {Electro-absorption of silicene and bilayer graphene quantum dots},
author = {Abdelsalam, Hazem, E-mail: hazem.abdelsalam@etu.u-picardie.fr and Department of Theoretical Physics, National Research Center, Cairo 12622 and Talaat, Mohamed H. and Lukyanchuk, Igor and L. D. Landau Institute for Theoretical Physics, Moscow and Portnoi, M. E. and Saroka, V. A., E-mail: v.saroka@exeter.ac.uk and Institute for Nuclear Problems, Belarusian State University, Bobruiskaya 11, 220030 Minsk},
abstractNote = {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 to their surface. Within the tight-binding model, the optical absorption is calculated for quantum dots, of triangular and hexagonal shapes, with zigzag and armchair edge terminations. We show that in triangular silicene clusters with zigzag edges 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 with zigzag edges the edge of absorption undergoes blue/red shift for triangular/hexagonal geometry. In armchair clusters of silicene blue shift of the absorption edge takes place for both cluster shapes, while red shift is inherent for both shapes of the bilayer graphene quantum dots.},
doi = {10.1063/1.4955222},
journal = {Journal of Applied Physics},
number = 1,
volume = 120,
place = {United States},
year = {Thu Jul 07 00:00:00 EDT 2016},
month = {Thu Jul 07 00:00:00 EDT 2016}
}