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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Related Experiment Video

Updated: May 24, 2026

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Many-electron scattering applied to atomic point contacts.

Shane McDermott1, J C Greer

  • 1Tyndall National Institute, Lee Maltings, University College Cork, Cork, Ireland. shane.mcdermott@tyndall.ie

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 29, 2012
PubMed
Summary

This study uses the Many-Electron Correlated Scattering (MECS) method to model electron transport in atomic point contacts. Calculations show a conductance of 0.6G(0), aligning with experimental gold point contact measurements.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Transport Phenomena
  • Computational Materials Science

Background:

  • Understanding electron transport at the atomic scale is crucial for nanoscale electronics.
  • Accurate theoretical modeling is needed to interpret experimental conductance measurements.
  • The many-electron correlated scattering (MECS) method offers a potential approach for such investigations.

Purpose of the Study:

  • To investigate electron transport in a strong coupling regime using the MECS method.
  • To estimate and attribute numerical errors in MECS calculations by comparing with experimental data.
  • To assess the impact of numerical approximations and electron-electron correlations on conductance predictions.

Main Methods:

  • Application of the many-electron correlated scattering (MECS) method.
  • Modeling of an atomic point contact system.
  • Comparison of theoretical calculations with experimental conductance quantum (G(0)) values for gold point contacts.
  • Assessment of errors from scattering boundary conditions, electrode modeling, and basis set description.

Main Results:

  • MECS calculations yielded a conductance of 0.6G(0) for the atomic point contact model.
  • This result is in reasonable agreement with experimental measurements for gold point contacts.
  • Numerical errors and explicit electrode model contributions were estimated to be less than 40% of the total conductance.
  • Electron-electron correlations were found to influence predicted conductance by up to 30%.

Conclusions:

  • The MECS method provides a viable approach for modeling electron transport in atomic contacts.
  • Numerical approximations and electrode modeling introduce manageable errors in MECS calculations.
  • Electron-electron correlations play a significant role in conductance, even in weakly correlated systems.