Coulomb decay rates in monolayer doped graphene

Chih Wei Chiu, Yue Lin Chung, Cheng Hsueh Yang, Chang Ting Liu, Chiun Yan Lin

研究成果: Article同行評審


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.

頁(從 - 到)2337-2346
期刊RSC Advances
出版狀態Published - 2020

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 化學工程 (全部)


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