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Excitons and plasmons of graphene nanoribbons in infrared frequencies in an effective-mass approximation

机译：石墨烯纳米中的激子和等离子体在有效质量近似下的红外频率

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摘要

Effects of electron-electron interactions on the optical response of graphene nanoribbons are theoretically investigated in an effective-mass approximation in a comprehensive manner. In optical absorption spectra of armchair and zigzag nanoribbons without and with doping, excitons, which are bound states of electrons and holes, and plasmons manifest themselves as various prominent peaks. For light polarized parallel to nanoribbons, exciton peaks at high energies split because of interactions with dark excitons, to which optical transition is prohibited. For light polarized perpendicular to nanoribbons, in nondoped semiconducting armchair nanoribbons, moderate exciton peaks appear while in doped armchair and zigzag nanoribbons, only when the Fermi energy crosses at least two energy bands, large plasmon peaks occur because of a nature of Dirac electrons. These peaks can be assigned to specific optical transitions in energy bands. The optical absorption peaks arising from the excitons and plasmons in a wide range of categories of nanoribbons approximately correspond to those of carbon nanotubes by appropriate scaling of energy and the wave vector.
机译：以综合方式理论上研究了石墨烯纳米波动光学响应对石墨烯纳米的效果。在没有掺杂的扶手椅和Zigzag纳米的光学吸收光谱中，激子，其是电子和孔的束缚状态，并且等离子体表现为各种突出的峰。对于平行于纳米纤维的光，由于与暗激子的相互作用，高能量的激子峰值，禁止光学转变。对于垂直于纳米波巴的光偏振，在掺杂的扶手椅和Zigzag纳米中出现中等激子峰，仅当费银能够穿过至少两个能带时，由于DIRAC电子的性质，发生了大的等离子体峰。可以将这些峰值分配给能量带中的特定光学转换。通过适当的能量和波向量的适当缩放，来自各种类别的纳米纳米的激子和等离子体中产生的光学吸收峰值近似对应于碳纳米管的那些。

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  • 来源
    《Physical review》 |2020年第15期|155409.1-155409.19|共19页
  • 作者

    Seiji Uryu;

  • 作者单位

    Department of Physical Science and Materials Engineering Iwate University 4-3-5 Ueda Morioka Iwate 020-8551 Japan;

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