Dielectric screening for carbon nanotubes in a gating electric field

S. C. Chen, F. L. Shyu, C. S. Lue, M. F. Lin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We use the sp3 tight-binding model to calculate electronic structures of single-walled carbon nanotubes. All the π and σ electrons would take part in charge screening. As a result of the cylindrical symmetry, the momentum (q) and angular momentum transfer (L) are conserved in the electron-electron Coulomb interactions. The static dielectric function ε (q,L), which determines the charge screening ability, is evaluated from the random-phase approximation. ε of L = 1 at long wavelength limit ( q → 0) is very important in understanding the dielectric screening in the presence of a uniform transverse electric field E. ε ( q = 0, L = 1) hardly depends on the chiral angle, and the dependence on the nanotube radius is weak. It quickly grows as the Fermi level increases, that is, the screening response is largely enhanced by the increasing free carriers.

Original languageEnglish
Pages (from-to)577-580
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume32
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2006 May

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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