...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Drude weight, plasmon dispersion, and ac conductivity in doped graphene sheets
【24h】

Drude weight, plasmon dispersion, and ac conductivity in doped graphene sheets

机译：掺杂石墨烯片中的Drude重量，等离激元色散和交流电导率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We demonstrate that the plasmon frequency and Drude weight of the electron liquid in a doped graphene sheet are strongly renormalized by electron-electron interactions even in the long-wavelength limit. This effect is not captured by the random-phase approximation (RPA), commonly used to describe electron fluids, and is due to coupling between the center-of-mass motion and the pseudospin degree of freedom of the graphene's massless Dirac fermions. By making use of diagrammatic perturbation theory to first order in the electron-electron interaction, we show that this coupling enhances both the plasmon frequency and the Drude weight relative to the RPA value. We also show that interactions are responsible for a significant enhancement of the optical conductivity at frequencies just above the absorption threshold. Our predictions can be checked by far-infrared spectroscopy or inelastic light scattering.
机译：我们证明，即使在长波长范围内，掺杂的石墨烯片中电子液体的等离激元频率和德鲁德重量也可以通过电子-电子相互作用强烈地重新归一化。通常用于描述电子流体的随机相位近似（RPA）无法捕获此效应，这是由于质量中心运动与石墨烯无质量Dirac费米子的伪自旋自由度之间的耦合引起的。通过在电子-电子相互作用中使用图解扰动理论至一阶，我们表明这种耦合相对于RPA值增强了等离子体激元频率和Drude权重。我们还表明，相互作用是在刚好高于吸收阈值的频率下光导率显着提高的原因。我们的预测可以通过远红外光谱或非弹性光散射来检验。

著录项

  • 来源
    《Physical review》 |2011年第4期|p.045429.1-045429.14|共14页
  • 作者

    Saeed H. Abedinpour; G. Vignale; A. Principi; Marco Poling; Wang-Kong Tse; A. H. MacDonald;

  • 作者单位

    Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA;

    Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA;

    NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, 1-56126 Pisa, Italy;

    NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, 1-56126 Pisa, Italy;

    Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA;

    Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    theories and models of many-electron systems;

    机译：多电子系统的理论和模型;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号