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首页> 外文期刊>Physical review >Electron polarization function and plasmons in metallic armchair graphene nanoribbons
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Electron polarization function and plasmons in metallic armchair graphene nanoribbons

机译：金属扶手椅石墨烯纳米带中的电子极化功能和等离激元

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摘要

Plasmon excitations in metallic armchair graphene nanoribbons are investigated using the random phase approximation. An exact analytical expression for the polarization function of Dirac fermions is obtained, valid for arbitrary temperature and doping. We find that at finite temperatures, due to the phase space redistribution among inter-band and intra-band electronic transitions in the conduction and valence bands, the full polarization function becomes independent of temperature and position of the chemical potential. It is shown that for a given width of nanoribbon there exists a single plasmon mode whose energy dispersion is determined by the graphene's fine structure constant. In the case of two Coulomb-coupled nanoribbons. this plasmon splits into in-phase and out-of-phase plasmon modes with splitting energy determined by the inter-ribbon spacing.
机译：使用随机相位近似研究金属扶手椅石墨烯纳米带中的等离子体激发。得到了狄拉克费米子极化函数的精确解析表达式，适用于任意温度和掺杂。我们发现在有限的温度下，由于导带和价带中带间和带内电子跃迁之间的相空间重新分布，完全极化函数变得与温度和化学势的位置无关。结果表明，对于给定的纳米带宽度，存在单个等离振子模式，其能量分散度由石墨烯的精细结构常数决定。在两个库仑耦合的纳米带的情况下。该等离激元分裂为同相和异相等离激元模式，其分裂能由色带间间距决定。

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  • 来源
    《Physical review》 |2015年第20期|205444.1-205444.6|共6页
  • 作者

    A. A. Shylau; S. M. Badalyan; F. M. Peeters; A. P. Jauho;

  • 作者单位

    Center for Nanostructured Graphene (CNG), Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark;

    Center for Nanostructured Graphene (CNG), Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark,Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium;

    Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium;

    Center for Nanostructured Graphene (CNG), Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark;

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  • 正文语种 eng
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  • 关键词

    collective excitations (including excitons, polarons, plasmons and other charge-density excitations); multilayers;

    机译：集体激发（包括激子;极化子;等离激元和其他电荷密度激发）;多层;

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