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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• Electronic Structure of Large-Scale Graphene Nanoflakes
• Dirac electrons in graphene-based quantum wires and quantum dots
• 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
• Multiorbital edge and corner states in black phosphorene
• Quantum Confinement of Electron-Phonon Coupling in Graphene Quantum Dots
• Exciton states in a circular graphene quantum dot: magnetic field induced intravalley to intervalley transition
• Electronic shell and supershell structure in graphene flakes
• Tuning of Zero Energy States in Quantum Dots of Silicene and Bilayer Graphene by Electric Field
• Remarkable band gap renormalization via dimensionality of the layered material C3B
• Many-Body Effect of Mesoscopic Localized States in MoS${}_2$ Monolayer
• Finite difference method for Dirac electrons in circular quantum dots
• 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
• The role of impurities on the optical properties of rectangular graphene flakes
• Greatly enhanced light emission of MoS${}_2$ using photonic crystal heterojunction
• Faraday rotations, ellipticity and circular dichroism in the magneto-optical spectrum of moiré superlattices
• XPS Supported INS and DRIFT Spectroscopy of sp2 Amorphous Carbons
• Electronic and optical properties of carbon nanodisks and nanocones