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Related Experiment Videos

Single-Electron Transport in Ropes of Carbon Nanotubes

Bockrath1, Cobden, McEuen

  • 1M. Bockrath, D. H. Cobden, P. L. McEuen, N. G. Chopra, A. Zettl, Molecular Design Institute, Lawrence Berkeley National Laboratory, and Department of Physics, University of California, Berkeley, CA 94720, USA. A. Thess and R. E. Smalley, Center for Nanoscale Science and Technology, Rice Quantum Institute, and Departments of Chemistry and Physics, Mail Stop 100, Rice University, Post Office Box 1892, Houston, TX 77251, USA.

Science (New York, N.Y.)
|March 28, 1997
PubMed
Summary

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Researchers measured the electrical properties of single-walled carbon nanotube ropes. Below 10 kelvin, suppressed conductance and gate-voltage-dependent peaks were observed, indicating single-electron charging and resonant tunneling effects.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Single-walled carbon nanotubes (SWCNTs) exhibit unique electrical properties due to their nanoscale dimensions.
  • Understanding electron transport in SWCNT bundles is crucial for developing novel electronic devices.
  • Quantum effects, such as Coulomb blockade, are expected to influence transport properties at low temperatures.

Purpose of the Study:

  • To investigate the low-temperature electrical transport characteristics of individual bundles of single-walled carbon nanotubes (SWCNTs).
  • To analyze the influence of gate voltage on the conductance of SWCNT ropes.
  • To interpret the observed phenomena in terms of fundamental quantum mechanical principles.

Main Methods:

  • Fabrication of individual SWCNT ropes on a substrate.

Related Experiment Videos

  • Low-temperature electrical measurements using a four-probe technique.
  • Variable low-bias voltage sweeps and gate voltage modulation.

    • Main Results:

    • Suppressed low-bias conductance observed below approximately 10 Kelvin for applied voltages below a few millivolts.
    • Distinct, dramatic peaks in conductance as a function of applied gate voltage.
    • Gate voltage modulation revealed discrete changes in electron occupation within the nanotube rope.

    Conclusions:

    • The observed suppressed conductance is attributed to Coulomb blockade, a manifestation of single-electron charging effects.
    • The conductance peaks are interpreted as resonant tunneling through quantized energy levels of the constituent nanotubes.
    • These findings highlight the importance of quantum confinement and electron-electron interactions in SWCNT ropes at low temperatures.