Band structure and absorption spectrum of double-walled zigzag carbon nanotubes in an electric field

G. W. Ho, Y. H. Ho, T. S. Li, C. P. Chang, Min-Fa Lin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The electronic structure of the (9, 0)-(18, 0) double-walled zigzag carbon nanotubes in the presence of a uniform transverse electric field is studied by the tight-binding model. The electric field could induce the semiconductor-metal transition, change the direct gap into the indirect gap, alter the subband curvatures, destroy the double degeneracy, produce the new band-edge states, make more subbands group around the Fermi level, and widen the π-band width. Such effects are directly reflected in density of states and optical excitation spectra. The absorption spectra exhibit a lot of prominent peaks, mainly owing to the rich one-dimensional energy subbands. The intensity, the number, and the frequency of absorption peaks are strongly modulated by the electric field. The modulation of electronic and optical properties is amplified by the parallel magnetic field. The predicted electronic and optical properties can be, respectively, verified by the conductance measurements and the optical spectroscopy.

Original languageEnglish
Pages (from-to)2323-2329
Number of pages7
JournalCarbon
Volume44
Issue number11
DOIs
Publication statusPublished - 2006 Sep 1

Fingerprint

Carbon Nanotubes
Band structure
Absorption spectra
Carbon nanotubes
Electric fields
Electronic properties
Optical properties
Photoexcitation
Fermi level
Electronic structure
Transition metals
Modulation
Semiconductor materials
Magnetic fields
Bandwidth

All Science Journal Classification (ASJC) codes

  • Materials Chemistry

Cite this

Ho, G. W. ; Ho, Y. H. ; Li, T. S. ; Chang, C. P. ; Lin, Min-Fa. / Band structure and absorption spectrum of double-walled zigzag carbon nanotubes in an electric field. In: Carbon. 2006 ; Vol. 44, No. 11. pp. 2323-2329.
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Band structure and absorption spectrum of double-walled zigzag carbon nanotubes in an electric field. / Ho, G. W.; Ho, Y. H.; Li, T. S.; Chang, C. P.; Lin, Min-Fa.

In: Carbon, Vol. 44, No. 11, 01.09.2006, p. 2323-2329.

Research output: Contribution to journalArticle

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AU - Ho, Y. H.

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AU - Lin, Min-Fa

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AB - The electronic structure of the (9, 0)-(18, 0) double-walled zigzag carbon nanotubes in the presence of a uniform transverse electric field is studied by the tight-binding model. The electric field could induce the semiconductor-metal transition, change the direct gap into the indirect gap, alter the subband curvatures, destroy the double degeneracy, produce the new band-edge states, make more subbands group around the Fermi level, and widen the π-band width. Such effects are directly reflected in density of states and optical excitation spectra. The absorption spectra exhibit a lot of prominent peaks, mainly owing to the rich one-dimensional energy subbands. The intensity, the number, and the frequency of absorption peaks are strongly modulated by the electric field. The modulation of electronic and optical properties is amplified by the parallel magnetic field. The predicted electronic and optical properties can be, respectively, verified by the conductance measurements and the optical spectroscopy.

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