• 文献标题:   Electron-electron interactions and plasmon dispersion in graphene
  • 文献类型:   Article
  • 作  者:   LEVITOV LS, SHTYK AV, FEIGELMAN MV
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:   MIT
  • 被引频次:   20
  • DOI:   10.1103/PhysRevB.88.235403
  • 出版年:   2013

▎ 摘  要

Plasmons in two-dimensional electron systems with nonparabolic bands, such as graphene, feature strong dependence on electron-electron interactions. We use a many-body approach to relate plasmon dispersion at long wavelengths to Landau Fermi-liquid interactions and quasiparticle velocity. An identical renormalization is shown to arise for the magnetoplasmon resonance. For a model with N >> 1 fermion species, this approach predicts a power-law dependence for plasmon frequency vs carrier concentration, valid in a wide range of doping densities, both high and low. Gate tunability of plasmons in graphene can be exploited to directly probe the effects of electron-electron interaction.