Tubular graphic carbon structures

Gao, Ying-Duo; Herndon, William C.

doi:10.1080/00268979200102641

Cited by 54 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the electronic structure of a single CN has been studied theoretically, which predicted that CN becomes either metallic or semiconducting depending on its chiral vector, i.e., boundary conditions in the circumference direction. [2][3][4][5][6][7][8][9][10][11] These predictions have been confirmed by Raman experiments 12) and direct measurements of local density of states by scanning tunneling spectroscopy. [13][14][15] In this paper we shall investigate effects of potential scattering in metallic nanotubes in the case of the presence of several current carrying channels.…”

Section: Introductionsupporting

confidence: 60%

Presence of Perfectly Conducting Channel in Metallic Carbon Nanotubes

2002

View full text Add to dashboard Cite

It is proved that a conducting channel transmitting perfectly without backscattering is present independent of energy in metallic carbon nanotubes for scatterers with potential range larger than the lattice constant. In the case that several traveling channels are present, the conductance decreases from the ideal value determined by the number of traveling modes to the single-channel value when the length exceeds the mean free path determined by a Boltzmann transport equation. Further, inelastic scattering makes the conductance decrease in proportion to the inverse of the length in qualitative agreement with the Boltzmann result.

show abstract

Section: Introductionsupporting

confidence: 60%

Presence of Perfectly Conducting Channel in Metallic Carbon Nanotubes

2002

View full text Add to dashboard Cite

show abstract

“…1) The electronic states change from metallic to semiconducting depending on the tubular circumferential vector characterizing a nanotube. The characteristic properties were predicted by calculations in tight-binding models [2][3][4][5][6][7][8][9][10][11] and also in a kÁp scheme or an effective-mass approximation. [12][13][14] Electron-phonon interactions can play an important role in the behavior of optical phonons in carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Optical Phonon Interacting with Electrons in Carbon Nanotubes

2006

View full text Add to dashboard Cite

Effects of interactions with electrons on optical phonons are studied in an effective-mass approximation. The longitudinal mode with displacement in the axis direction is lowered in its frequency, while the transverse mode with displacement in the circumference direction is raised, in metallic nanotubes. The shifts are opposite but their absolute values are smaller in semiconducting nanotubes. Only the longitudinal mode has a considerable broadening in metallic nanotubes. In the presence of an Aharonov-Bohm magnetic flux, the broadening appears for the transverse mode and diverges when the induced gap becomes the same as the frequency of the optical phonon.

show abstract

“…The characteristic properties were first predicted by the band-structure calculation in a tightbinding model [2][3][4][5][6][7][8][9][10] and successfully reproduced in a k Á p scheme or an effective-mass approximation. 11,12) The purpose of this work is to study effects of the mutual Coulomb interaction on the band structure within such a k Á p scheme.…”

Section: Introductionmentioning

confidence: 99%

Effective-Mass Theory of Electron Correlations in Band Structure of Semiconducting Carbon Nanotubes

2003

View full text Add to dashboard Cite

The band gap, the single-particle energy, and the effective mass are calculated for semiconducting carbon nanotubes in a random-phase approximation within a k Á p scheme. The energy gaps are shown to be strongly enhanced due to the Coulomb interaction, while effects on the effective mass along the axis direction are small. For realistic values of the interaction parameter, effects of the dynamical screening are sufficiently weak, and the conventional screened Hartree-Fock approximation is shown to work quite well. Further, the band gap contains a term with a residual logarithmic dependence on the tube diameter d after being scaled by 1=d.

show abstract

Tubular graphic carbon structures

Cited by 54 publications

References 14 publications

Presence of Perfectly Conducting Channel in Metallic Carbon Nanotubes

Presence of Perfectly Conducting Channel in Metallic Carbon Nanotubes

Optical Phonon Interacting with Electrons in Carbon Nanotubes

Effective-Mass Theory of Electron Correlations in Band Structure of Semiconducting Carbon Nanotubes

Contact Info

Product

Resources

About