Tuning of energy levels and optical properties of graphene quantum dots
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Open Access
- 6 June 2008
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 77 (23), 235411
- https://doi.org/10.1103/physrevb.77.235411
Abstract
We investigate theoretically the magnetic levels and optical properties of zigzag- and armchair-edged hexagonal graphene quantum dots (GQDs) utilizing the tight-binding method. A bound edge state at zero energy appears for the zigzag GQDs in the absence of a magnetic field. The magnetic levels of GQDs exhibit a Hofstadter-butterfly spectrum and approach the Landau levels of two-dimensional graphene as the magnetic field increases. The optical properties are tuned by the size, the type of the edge, and the external magnetic field.Keywords
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