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Coulomb decay rates in monolayer doped graphene

机译:在单层掺杂石墨烯的库仑衰减率

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摘要

Excited conduction electrons, conduction holes, and valence holes in monolayer electron-doped graphene exhibit unusual Coulomb decay rates. The deexcitation processes are studied using the screened exchange energy. They might utilize the intraband and interband single-particle excitations, as well as the plasmon modes, depending on the quasiparticle states and the Fermi energies. The low-lying valence holes can decay through the undamped acoustic plasmon, so that they present very fast Coulomb deexcitations, nonmonotonous energy dependence, and anisotropic behavior. However, the low-energy conduction electrons and holes are similar to those in a two-dimensional electron gas. The higher-energy conduction states and the deeper-energy valence ones behave similarly in the available deexcitation channels and have a similar dependence of decay rate on the wave vector.
机译:激励的传导电子,传导孔和单层电子掺杂石墨烯的价孔表现出异常的库仑衰减率。 使用筛选的交换能量研究了脱释过程。 它们可以利用内部内部和带间单粒子激励,以及等离子体模式,具体取决于Quasiplicle状态和费米能量。 低洼的价孔可以衰减通过透明的声量变,使它们呈现出非常快的库仑脱释,非单调能量依赖性和各向异性行为。 然而,低能量传导电子和孔类似于二维电子气体的孔。 在可用的脱尿通道中,更高能量的传导状态和更深的能量价值在可用的脱尿通道中表现得类似,并且在波向量上具有衰减率的类似依赖性。

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  • 来源
    《RSC Advances》 |2020年第4期|共10页
  • 作者单位

    Natl Kaohsiung Normal Univ Dept Phys Kaohsiung 824 Taiwan;

    Natl Kaohsiung Normal Univ Dept Phys Kaohsiung 824 Taiwan;

    Natl Cheng Kung Univ Dept Phys Tainan 701 Taiwan;

    Natl Kaohsiung Normal Univ Dept Phys Kaohsiung 824 Taiwan;

    Natl Cheng Kung Univ Dept Phys Tainan 701 Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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