Plasma excitations in graphene: Their spectral intensity and temperature dependence in magnetic field

Jhao Ying Wu, Szu Chao Chen, Oleksiy Roslyak, Godfrey Gumbs, Ming Fa Lin

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

In this paper, we calculated the dielectric function, the loss function, the magnetoplasmon dispersion relation and the temperature-induced transitions for graphene in a uniform perpendicular magnetic field B. The calculations were performed using the Peierls tight-binding model to obtain the energy band structure and the random-phase approximation to determine the collective plasma excitation spectrum. The single-particle and collective excitations have been precisely identified based on the resonant peaks in the loss function. The critical wave vector at which plasmon damping takes place is clearly established. This critical wave vector depends on the magnetic field strength as well as the levels between which the transition takes place. The temperature effects were also investigated. At finite temperature, there are plasma resonances induced by the Fermi distribution function. Whether such plasmons exist is mainly determined by the field strength, temperature, and momentum. The inelastic light scattering spectroscopies could be used to verify the magnetic field and temperature induced plasmons.

Original languageEnglish
Pages (from-to)1026-1032
Number of pages7
JournalACS Nano
Volume5
Issue number2
DOIs
Publication statusPublished - 2011 Feb 22

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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