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Related Experiment Videos

Quantum interference in carbon-nanotube electron resonators.

Jie Jiang1, Jinming Dong, D Y Xing

  • 1Group of Computational Condensed Matter Physics, National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.

Physical Review Letters
|August 9, 2003
PubMed
Summary

A new quantum interference mechanism explains slow conductance fluctuations in metallic nanotube resonators. This phenomenon, observed in nanotube electron devices, is independent of gate voltage efficiency and depends solely on nanotube length.

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Area of Science:

  • Condensed Matter Physics
  • Nanotechnology
  • Quantum Mechanics

Background:

  • Conductance fluctuations in nanotube electron resonators are a known phenomenon.
  • Existing models do not fully explain slow conductance fluctuations.

Purpose of the Study:

  • To propose a new mechanism for slow conductance fluctuations in nanotube electron resonators.
  • To investigate the nature of these fluctuations as an intrinsic quantum interference phenomenon.

Main Methods:

  • Theoretical analysis of conductance fluctuations in metallic nanotube resonators.
  • Derivation of analytical expressions for oscillation periods.

Main Results:

  • A new mechanism involving intrinsic quantum interference is proposed.

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  • Slow conductance fluctuations are predicted to exist in all metallic nanotube resonators except zigzag ones.
  • Analytical expressions for slow and rapid oscillation periods are derived and show good agreement with experiments.

    • Conclusions:

    • The proposed quantum interference mechanism accurately explains slow conductance fluctuations.
    • The ratio of slow to rapid oscillation periods is independent of gate-voltage efficiency and is determined by nanotube length.