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Related Experiment Videos

Limiting current density in a crossed-field nanogap.

L K Ang1, T J Kwan, Y Y Lau

  • 1Applied Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 20, 2001
PubMed
Summary

Quantum tunneling significantly boosts limiting current density in nanogaps smaller than electron wavelengths. External magnetic field effects decrease as gap spacing shrinks, showing a smooth transition between classical and quantum regimes.

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Area of Science:

  • Physics
  • Nanotechnology
  • Quantum Mechanics

Background:

  • Classical models for limiting current density in nanogaps.
  • The role of external magnetic fields in electron transport.
  • The influence of quantum effects at nanoscale dimensions.

Purpose of the Study:

  • Investigate the quantum extension of limiting current density in a crossed-field nanogap.
  • Analyze the impact of electron tunneling on current density.
  • Examine the interplay between magnetic fields and quantum effects.

Main Methods:

  • Application of mean-field theory.
  • Theoretical study of electron transport in nanogaps.
  • Analysis of quantum mechanical effects like tunneling.

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Main Results:

  • Limiting current density increases significantly due to electron tunneling when gap spacing is less than electron wavelength.
  • External magnetic field effects diminish as nanogap spacing decreases.
  • A smooth transition from classical to quantum regimes is observed.

Conclusions:

  • Quantum tunneling is a dominant factor for current density in sub-wavelength nanogaps.
  • The influence of magnetic fields is reduced in the quantum regime.
  • The study provides a theoretical framework for understanding electron transport in nanoscale devices.