Energy Gaps in "Metallic" Single-Walled Carbon Nanotubes

  title={Energy Gaps in "Metallic" Single-Walled Carbon Nanotubes},
  author={Minting Ouyang and Jinlin Huang and Chin Li Cheung and Charles M. Lieber},
  pages={702 - 705}
Metallic single-walled carbon nanotubes have been proposed to be good one-dimensional conductors. However, the finite curvature of the graphene sheet that forms the nanotubes and the broken symmetry due to the local environment may modify their electronic properties. We used low-temperature atomically resolved scanning tunneling microscopy to investigate zigzag and armchair nanotubes, both thought to be metallic. “Metallic” zigzag nanotubes were found to have energy gaps with magnitudes that… 

Universal interaction-driven gap in metallic carbon nanotubes

Suspended metallic carbon nanotubes (m-CNTs) exhibit a remarkably large transport gap that can exceed 100 meV. Both experiment and theory suggest that strong electron-electron interactions play a

Metallic and semiconducting narrow carbon nanotubes

We report local-density-functional results that show that narrow nanotubes with optimized diameters between about 0.34 and 0.5 nm can be either semiconducting or metallic, but with electron


Based upon the Slater–Koster tight-binding calculations, we investigated electronic properties of the "metallic" single-walled carbon nanotubes (SWNTs) in detail. Our results show that tube curvature

Silicon and III-V compound nanotubes: Structural and electronic properties

Unusual physical properties of single-wall carbon nanotubes have started a search for similar tubular structures of other elements. In this paper, we present a theoretical analysis of single-wall

The calculation of energy gaps in small single-walled carbon nanotubes within a symmetry-adapted tight-binding model

This paper studies in detail the electronic properties of the semimetallic single-walled carbon nanotubes by applying the symmetry-adapted tight-binding model. It is found that the hybridization of

Curvature and strain effects on electronic properties of single-wall carbon nanotubes

To describe accurately the electronic structures of carbon nanotubes, a semi-empirical tight-binding approach is presented in which the main intrinsic curvatures have been fully taken into account.

Fundamental electronic properties and applications of single-walled carbon nanotubes.

Recent scanning tunneling microscopy studies of the intrinsic electronic properties of single-walled carbon nanotubes (SWNTs) are overviewed and the implications for understanding fundamental one-dimensional physics and future nanotube device applications are discussed.

Magnetic properties of vacancies in graphene and single-walled carbon nanotubes

Spin-polarized density functional theory has been used to study the properties of vacancies in a graphene sheet and in single-walled carbon nanotubes (SWNTs). For graphene, we find that the vacancies



Atomic structure and electronic properties of single-walled carbon nanotubes

Carbon nanotubes are predicted to be metallic or semiconducting depending on their diameter and the helicity of the arrangement of graphitic rings in their walls. Scanning tunnelling microscopy (STM)

Electronic structure of atomically resolved carbon nanotubes

Carbon nanotubes can be thought of as graphitic sheets with a hexagonal lattice that have been wrapped up into a seamless cylinder. Since their discovery in 1991, the peculiar electronic properties

Broken symmetry and pseudogaps in ropes of carbon nanotubes

Since the discovery of carbon nanotubes, it has been speculated that these materials should behave like nanoscale wires with unusual electronic properties and exceptional strength. Recently, ‘ropes’

Spectroscopic properties and STM images of carbon nanotubes

We present a theoretical study of the role of the local environment in the electronic properties of carbon nano- tubes: isolated single- and multi-wall nanotubes, nanotube ropes, tubes supported on

Size, Shape, and Low Energy Electronic Structure of Carbon Nanotubes

A theory of the long-wavelength low-energy electronic structure of graphite-derived nanotubules is presented. The propagating {pi} electrons are described by wrapping a massless two dimensional Dirac

Structure and Electronic Properties of Carbon Nanotubes

Scanning tunneling microscopy, spectroscopy, and tight-binding calculations have been used to elucidate the unique structural and electronic properties of single-walled carbon nanotubes (SWNTs).

Electronic Density of States of Atomically Resolved Single-Walled Carbon Nanotubes: Van Hove Singularities and End States

The electronic densities of states of atomically resolved single-walled carbon nanotubes have been investigated using scanning tunneling microscopy. Peaks in the density of states due to the

Electronic structure of deformed carbon nanotubes

  • YangHan
  • Physics
    Physical review letters
  • 2000
The theory unriddles and unifies previous band gap studies and predicts the shifting, merging, and splitting of Van Hove singularities in the density of state, and the zigzag pattern of band gap change with strains.

Structural properties of a carbon-nanotube crystal.

  • TersoffRuoff
  • Materials Science, Physics
    Physical review letters
  • 1994
The ordered condensed phase of carbon nanotubes is examined, finding that as the tube diameter varies, the structural properties show a clear transition between two regimes with qualitatively different behavior.

Electronic structure of graphene tubules based on C60.

A simple tight-binding model shows that some fibers are metallic and are stable against perturbations of the one-dimensional energy bands and the mixing of σ and π bands due to the curvature of the circumference of the fiber.