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Disorder screening in strongly correlated systems.

D Tanasković1, V Dobrosavljević, E Abrahams

  • 1Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.

Physical Review Letters
|August 26, 2003
PubMed
Summary

Strong electron correlations enhance screening effects and stabilize metallicity, even when compressibility is reduced. This is due to nonperturbative Kondo-like processes, unlike weak-coupling theories.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Electron-electron interactions typically reduce low-temperature resistivity by screening impurity potentials.
  • In weak-coupling systems, screening is governed by thermodynamic compressibility and screening length.
  • Existing weak-coupling approaches do not fully capture the effects of strong correlations.

Purpose of the Study:

  • To investigate the impact of strong electron correlations on the screening of impurity potentials.
  • To explore the role of nonperturbative processes in electron-electron interactions.
  • To predict conditions for the stabilization of metallicity in disordered systems.

Main Methods:

  • Theoretical analysis of electron-electron interactions in the presence of strong correlations.

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  • Investigation of nonperturbative Kondo-like processes.
  • Examination of the relationship between compressibility, screening length, and resistivity.

    • Main Results:

    • Strong correlations significantly enhance the screening effect, despite reduced compressibility.
    • This enhancement is attributed to nonperturbative Kondo-like processes, absent in weak-coupling models.
    • Metallicity is predicted to be strongly stabilized when interactions and disorder are comparable.

    Conclusions:

    • Strongly correlated electron systems exhibit enhanced screening mechanisms beyond weak-coupling predictions.
    • Kondo-like physics plays a crucial role in understanding these phenomena.
    • The findings suggest new pathways for stabilizing metallic states in materials with competing interactions and disorder.