Tuning of energy levels and optical properties of graphene quantum dots

Details Tuning of energy levels and optical properties of graphene quantum dots Tuning of energy levels and optical properties of graphene quantum dots

2008-05-05

arxiv.org/abs/0805.0454v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1103/PhysRevB.77.235411

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.

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