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Related Experiment Videos

Soft fermi surfaces and breakdown of Fermi-liquid behavior.

W Metzner1, D Rohe, S Andergassen

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

Physical Review Letters
|August 26, 2003
PubMed
Summary

Electron-electron interactions cause Fermi surface deformations, leading to a Pomeranchuk instability. Critical fluctuations near this instability destroy Fermi-liquid behavior across most of the surface.

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Area of Science:

  • Condensed matter physics
  • Quantum materials
  • Many-body physics

Background:

  • Electron-electron interactions can significantly alter electronic properties.
  • Pomeranchuk instabilities involve Fermi surface deformations breaking lattice symmetry.
  • Anisotropic perturbations near these instabilities enhance collective fluctuations.

Purpose of the Study:

  • Investigate the impact of critical Fermi surface fluctuations on single-particle excitations.
  • Analyze the behavior of Fermi-liquid theory near a d-wave Pomeranchuk instability.
  • Determine the conditions under which Fermi-liquid behavior is preserved or destroyed.

Main Methods:

  • Theoretical analysis of electron-electron interactions in two dimensions.
  • Study of critical fluctuations near a d-wave Pomeranchuk instability.

Related Experiment Videos

  • Calculation of single-particle excitation decay rates.

    • Main Results:

    • Critical Fermi surface fluctuations induce large anisotropic decay rates.
    • Fermi-liquid behavior is destroyed over most of the Fermi surface.
    • An exception to the destroyed Fermi-liquid behavior is observed at the Brillouin zone diagonal.

    Conclusions:

    • The study highlights the breakdown of Fermi-liquid theory due to critical fluctuations.
    • Anisotropic decay rates are a key consequence of Pomeranchuk instabilities.
    • Understanding these effects is crucial for predicting properties of strongly correlated electron systems.