Coulomb decay rates in monolayer doped graphene

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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)2337-2346
Number of pages10
JournalRSC Advances
Volume10
Issue number4
DOIs
Publication statusPublished - 2020 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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    Chiu, C. W., Chung, Y. L., Yang, C. H., Liu, C. T., & Lin, C. Y. (2020). Coulomb decay rates in monolayer doped graphene. RSC Advances, 10(4), 2337-2346. https://doi.org/10.1039/c9ra05953a