Magnetoabsorption spectra of bilayer graphene ribbons with Bernal stacking

Y. C. Huang, C. P. Chang, M. F. Lin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Magnetoabsorption spectra of bilayer graphene ribbons with Bernal stacking are studied by the Peierls-coupling tight-binding method. When the magnetic confinement prevails over the quantum confinement, low-energy spectra chiefly exhibit many Landau peaks, which are strongly modified by the inter-ribbon interactions and the magnetic-field magnitude (B). The spectra show denser Landau peaks in bilayer graphene ribbon than in a monolayer ribbon with the same ribbon width. The absorption frequencies of Landau peaks of a wide monolayer ribbon show the √B dependence, while those of a bilayer ribbon exhibit a varying B-field dependence. In the spectra region ω≤100 meV, the absorption frequencies of Landau peaks are linearly dependent on the magnetic-field magnitude. At ω≥100 meV, they evolve from the B dependence to the √B dependence with the increase in the field strength. The absorption frequencies of Landau peaks exhibit √B dependence at B≥20 T. The relationship between the magneto-optical properties and electronic structures (the state energies and wave functions) are explored. The Landau wave functions are illustrated and used to identify the optical selection rule.

Original languageEnglish
Article number115422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number11
DOIs
Publication statusPublished - 2008 Sep 22

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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