Tuning of energy levels and optical properties of graphene quantum dots

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 new 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.

arXiv comment5 pages, 7 figures. to appear in Phys. Rev. B

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Cited by in corpus (66)

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• Electronic Structure of Large-Scale Graphene Nanoflakes
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• Electronic properties of bilayer phosphorene quantum dots in the presence of perpendicular electric and magnetic fields
• Unique nature of the lowest Landau level in finite graphene samples with zigzag edges: Dirac electrons with mixed bulk-edge character
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• Finite difference method for Dirac electrons in circular quantum dots
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