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Related Experiment Videos

Effective Kondo model for a trimer on a metallic surface.

A A Aligia1

  • 1Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina.

Physical Review Letters
|April 12, 2006
PubMed
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This study models localized orbitals in atoms using the Hubbard-Anderson model. It derives an effective Kondo model, finding the Kondo temperature depends on atomic distances, matching experimental Cr trimer data.

Area of Science:

  • Condensed Matter Physics
  • Quantum Chemistry
  • Surface Science

Background:

  • The Hubbard-Anderson model describes interacting localized electrons and extended states.
  • Understanding hybridization in multi-atom systems is crucial for materials science.

Purpose of the Study:

  • To derive an effective Kondo model for a trimer system.
  • To investigate the relationship between atomic geometry and the Kondo temperature.

Main Methods:

  • Utilized a generalized Schrieffer-Wolf transformation.
  • Analyzed an isosceles trimer with specific atomic distances (a, l, l).

Main Results:

  • Derived an effective Kondo model for the trimer's ground state interaction with extended states.

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  • Found the Kondo temperature is minimal for la for small 'a'.
  • Achieved agreement with experimental data for a Chromium (Cr) trimer on Gold (Au)(111).

    • Conclusions:

    • The atomic arrangement significantly influences the Kondo temperature in such systems.
    • The derived model provides a theoretical framework for understanding experimental observations in surface-adsorbate systems.