Low-frequency electronic excitations in doped carbon nanotubes

M. F. Lin, F. L. Shyu

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We study the low-frequency electronic excitations of a doped carbon nanotube. The longitudinal dielectric function, the loss function, and the plasmon frequencies are calculated within the random phase approximation. They strongly depend on the transferred momentum (q), the transferred angular momentum (L), the Fermi energy, and the nanotube geometry (the radius and the chiral angle). All the doped carbon nanotubes could exhibit the L = 0 acoustic plasmon. There also exists the L = 1 optical plasmon, when the Fermi energy is sufficiently high. There are several important differences between type-I nanotubes and type-II nanotubes. The local-field corrections on the loss spectra and the plasmon frequencies are discussed.

Original languageEnglish
Pages (from-to)117-126
Number of pages10
JournalPhysica B: Condensed Matter
Volume292
Issue number1-2
DOIs
Publication statusPublished - 2000 Oct 2

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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