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Electron-phonon interaction and antiferromagnetic correlations.

G Sangiovanni1, O Gunnarsson, E Koch

  • 1Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Physical Review Letters
|August 16, 2006
PubMed
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Antiferromagnetic correlations boost electron-phonon interaction effects, but Coulomb repulsion moderately suppresses them in the Holstein-Hubbard model. Doping further reduces this interaction, especially for phonons.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • The electron-phonon interaction (EPI) is crucial for understanding material properties.
  • The Holstein-Hubbard model describes correlated electrons interacting with lattice vibrations.
  • Antiferromagnetic (AF) correlations can significantly influence electronic and phononic behavior.

Purpose of the Study:

  • To investigate the impact of Coulomb repulsion on EPI within the Holstein-Hubbard model.
  • To analyze the role of antiferromagnetic (AF) correlations in modifying EPI effects.
  • To determine how doping affects EPI under Coulomb interaction and AF correlations.

Main Methods:

  • Utilizing the antiferromagnetic (AF) dynamical mean-field approximation.
  • Analyzing the electron Green's function and phonon properties.

Related Experiment Videos

  • Comparing results with paramagnetic correlated systems.

    • Main Results:

    • AF correlations strongly enhance EPI effects on the electron Green's function compared to paramagnetic systems.
    • Coulomb interaction moderately suppresses overall EPI, with further suppression upon doping.
    • Coulomb interaction strongly suppresses EPI effects on phonons, with reduced suppression upon doping.

    Conclusions:

    • Antiferromagnetic correlations significantly impact electron-phonon interactions.
    • Coulomb repulsion plays a dual role, enhancing EPI effects on electrons via AF correlations but suppressing overall EPI and phonon interactions.
    • Doping introduces further suppression of electron-phonon interactions, particularly affecting phonons.