Electric-field-tunable electronic properties of graphene quantum dots

R. B. Chen, C. P. Chang, M. F. Lin

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The tight-binding method is employed to investigate the electronic properties of a square graphene quantum dot subject to an in-plane electric field (F). The electronic properties are strongly modified by tuning the field strength or altering the field direction. F will change state energies, alter energy gaps, and induce energy gap modulations. State energies show oscillatory behavior with the change of the field strength. The oscillating amplitude and period are further modulated by the change of the field direction. The field-orientation-dependent electronic properties originate in the geometrical anisotropy of the square graphene quantum dot. Moreover, the density of states (DOS), exhibiting many discrete peaks, directly reveals the characteristic of the electric-field-tunable electronic properties. The number and frequencies of DOS peaks are significantly dependent on the field strength and direction.

Original languageEnglish
Pages (from-to)2812-2815
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number10
DOIs
Publication statusPublished - 2010 Sep

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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