Low-energy electronic properties of finite double-walled carbon nanotubes under external fields

C. H. Lee, W. S. Su, R. B. Chen, M. F. Lin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Using the 2 pz tight-binding model, we investigated the electronic properties of finite double-walled carbon nanotubes (DWCNTs) under static electric and magnetic fields. It was found that for low-energy electronic structures, their energy levels, density of states and energy gap are obviously affected by symmetric configurations as well as electric and magnetic fields. The intertube atomic interactions remarkably change the state energies, modulate the energy gap, and break the state symmetry about the Fermi level. Moreover, both electric and magnetic fields can destroy the degeneracy and modulate the above-mentioned electronic properties. The magnetic fields with various directions also induce variation of electronic structure. As the magnitude of electric fields perpendicular to the tube axis increases, more energy states gather around the Fermi energy, which, as a result, causes a complicated variation of energy gap.

Original languageEnglish
Pages (from-to)1226-1231
Number of pages6
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume41
Issue number7
DOIs
Publication statusPublished - 2009 Jun 1

All Science Journal Classification (ASJC) codes

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

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