Combined effect of stacking and magnetic field on plasmon excitations in bilayer graphene

Jhao Ying Wu, Godfrey Gumbs, Min-Fa Lin

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The electronic excitations of bilayer graphene (BLG) under a magnetic field are investigated with the use of the Peierls tight-binding model in conjunction with random-phase approximation (RPA). The interlayer atomic interactions, interlayer Coulomb interactions, and magnetic field effects are simultaneously included in the dielectric-function matrix. That enables us to derive the magneto-Coulomb-excitation spectrum of different stacking structures. The two typical arrangements of BLGs, AB and AA, are considered in this article. AB-BLG exhibits many discrete energy-loss peaks, which correspond to the quantization of electron energies. On the other hand, the AA-BLG spectra possess a unique and pronounced peak at low frequency. This peak represents the collective excitation of the entire low-frequency Landau states. The dependence of the energy-loss peaks on the momentum transfer and the magnetic field strength is presented. Accordingly, two kinds of plasmon modes produced by the layer stacking are clearly distinguished.

Original languageEnglish
Article number165407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number16
DOIs
Publication statusPublished - 2014 Apr 7

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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