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Related Experiment Videos

Dynamic Hubbard model.

J E Hirsch1

  • 1Department of Physics, University of California-San Diego, La Jolla, California 92093-0319, USA.

Physical Review Letters
|November 3, 2001
PubMed
Summary
This summary is machine-generated.

This study refines the Hubbard model for electronic correlations in solids, introducing a new mechanism for superconductivity via quasiparticle undressing and predicting novel electroluminescence effects.

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Area of Science:

  • Condensed Matter Physics
  • Solid-State Physics
  • Quantum Mechanics

Background:

  • The Hubbard model is crucial for understanding electronic correlation in solids, with on-site repulsion (U) being a key factor.
  • Experimental values of atomic U often differ from theoretical calculations of the Coulomb integral.

Purpose of the Study:

  • To extend the Hubbard model by incorporating the discrepancy between experimental and calculated atomic U.
  • To investigate the resulting quasiparticle behavior and its implications for superconductivity.
  • To explore observable signatures in both normal and superconducting states, including novel phenomena.

Main Methods:

  • Modification of the Hubbard model to account for differing experimental and calculated atomic U.
  • Analysis of quasiparticle properties as a function of electron band filling.

Related Experiment Videos

  • Theoretical investigation of superconductivity arising from quasiparticle undressing.
  • Prediction of spectroscopic signatures and a novel electroluminescence effect.

    • Main Results:

    • The extended Hubbard model describes quasiparticles that become increasingly 'dressed' with increasing electron band filling.
    • Superconductivity can emerge in this model through a process termed 'quasiparticle undressing'.
    • A novel electroluminescence effect is predicted at the sample-positive counterelectrode boundary in the normal state.

    Conclusions:

    • The modified Hubbard model provides a new framework for understanding electronic correlation and superconductivity in solids.
    • Quasiparticle undressing offers a distinct mechanism for achieving superconductivity.
    • The predicted electroluminescence effect presents a new avenue for experimental verification and potential applications.