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Related Experiment Videos

Gap formation and soft phonon mode in the Holstein model.

D Meyer1, A C Hewson, R Bulla

  • 1Department of Mathematics, Imperial College, London SW7 2BZ, United Kingdom. d.meyer@ic.ac.uk

Physical Review Letters
|November 22, 2002
PubMed
Summary

Electron-phonon coupling in many-electron systems shows precursor effects to gap formation. This Kondo-like physics involves soft phonon modes and lattice fluctuations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Theory

Background:

  • Electron-phonon coupling is crucial for material properties.
  • Understanding many-electron systems requires advanced theoretical methods.

Purpose of the Study:

  • Investigate electron-phonon coupling in many-electron systems.
  • Explore precursor effects to gap formation at intermediate coupling.

Main Methods:

  • Dynamical Mean-Field Theory (DMFT).
  • Numerical Renormalization Group (NRG).
  • Combined nonperturbative approach.

Main Results:

  • Observed significant precursor effects to gap formation.
  • Identified Kondo-like physics driving these effects.
  • Found emergence of soft phonon modes and strong lattice fluctuations.

Conclusions:

  • Double-well structure in the effective ionic potential explains observed phenomena.
  • Nonperturbative DMFT-NRG is effective for studying electron-phonon coupling.

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