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.

5 pages, 7 figures. to appear in Phys. Rev. B

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Cited by in corpus (9)

• Analytic Model for the Energy Spectrum of a Graphene Quantum Dot in a Perpendicular Magnetic Field
• Inner and outer edge states in graphene rings: A numerical investigation
• Orbital magnetism of graphene flakes
• Dirac electrons in graphene-based quantum wires and quantum dots
• Unique nature of the lowest Landau level in finite graphene samples with zigzag edges: Dirac electrons with mixed bulk-edge character
• Electronic shell and supershell structure in graphene flakes
• Electronic and transport properties of rectangular graphene macromolecules and zigzag carbon nanotubes of finite length
• Graphene flakes with defective edge terminations: Universal and topological aspects, and one-dimensional quantum behavior
• Electronic and optical properties of carbon nanodisks and nanocones