Coulomb decay rates in monolayer doped graphene

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 a...

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Bibliographic Details
Published in:RSC advances 2020-01, Vol.1 (4), p.2337-2346
Main Authors: Chiu, Chih-Wei, Chung, Yue-Lin, Yang, Cheng-Hsueh, Liu, Chang-Ting, Lin, Chiun-Yan
Format: Article
Language:English
Subjects:
Chemistry
Conduction electrons
Decay rate
Dependence
Electron gas
Electrons
Graphene
Monolayers
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Summary: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. Excited conduction electrons, conduction holes, and valence holes in monolayer electron-doped graphene exhibit unusual Coulomb decay rates.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra05953a