Electron-electron interactions and plasmon dispersion in graphene
Electron-electron interactions and plasmon dispersion in graphene
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DOI：
10.1103/physrevb.88.235403
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发表时间：
2013-12-02
影响因子：
3.7
通讯作者：
Feigelman, M. V.
中科院分区：
文献类型：
--
作者：
Levitov, L. S.;Shtyk, A. V.;Feigelman, M. V.
具有非抛物能带的二维电子系统（如石墨烯）中的等离子体激元具有对电子-电子相互作用的强烈依赖性。我们使用多体方法，在长波长的朗道费米液体相互作用和准粒子速度等离子体色散。一个相同的重整化所示，出现的磁等离子体共振。对于具有N >> 1费米子物质的模型，该方法预测等离子体频率与载流子浓度的幂律依赖性，在宽范围的掺杂密度（高和低）中有效。石墨烯中等离子体激元的栅极可调谐性可以被用来直接探测电子-电子相互作用的影响。
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.