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Related Experiment Videos

Electrical switching in metallic carbon nanotubes.

Young-Woo Son1, Jisoon Ihm, Marvin L Cohen

  • 1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.

Physical Review Letters
|December 31, 2005
PubMed
Summary

Metallic carbon nanotubes with defects exhibit dramatically tunable resistance under transverse electric fields. This effect, driven by field-dependent electron backscattering, offers potential for novel electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Metallic carbon nanotubes (CNTs) are promising materials for electronic applications.
  • Their electrical properties are sensitive to structural defects and external fields.
  • Understanding transport mechanisms in defective CNTs is crucial for device design.

Purpose of the Study:

  • To investigate the impact of transverse electric fields on the resistance of metallic carbon nanotubes with impurities or defects.
  • To explore the underlying physical mechanisms responsible for changes in electrical resistance.
  • To assess the potential for novel device applications based on this tunable resistance property.

Main Methods:

  • First-principles calculations of quantum transport.

Related Experiment Videos

  • Simulation of homogeneous transverse electric fields applied to defective metallic CNTs.
  • Analysis of electron backscattering phenomena.

    • Main Results:

    • Resistance of metallic CNTs with defects can be changed by over two orders of magnitude using experimentally achievable electric fields.
    • The observed resistance modulation is strongly dependent on the electric field's strength and direction.
    • The origin of this tunability lies in the field-dependent backscattering of conduction electrons by defects.

    Conclusions:

    • Defective metallic carbon nanotubes exhibit a significant, field-tunable resistance.
    • This property, stemming from controlled electron backscattering, paves the way for new applications in nanoelectronics.
    • The findings suggest a new paradigm for manipulating electronic transport in nanostructured materials.