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Related Experiment Videos

All-electron self-consistent GW approximation: application to Si, MnO, and NiO.

Sergey V Faleev1, Mark van Schilfgaarde, Takao Kotani

  • 1Sandia National Laboratories, Livermore, CA 94551, USA.

Physical Review Letters
|September 28, 2004
PubMed
Summary

This study introduces a self-consistent GW approximation using the all-electron, full-potential linear muffin-tin orbital method. This approach accurately describes electronic structures in semiconductors and correlated materials like MnO and NiO.

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Area of Science:

  • Condensed Matter Physics
  • Computational Materials Science
  • Quantum Chemistry

Background:

  • The accurate description of electronic structure is crucial for understanding material properties.
  • Traditional methods often struggle with correlated materials, necessitating advanced approximations.
  • The GW approximation is a powerful tool for electronic structure calculations.

Purpose of the Study:

  • To develop and present a novel self-consistent GW approximation.
  • To improve the accuracy of electronic structure calculations, particularly for correlated systems.
  • To validate the new method against experimental data for representative materials.

Main Methods:

  • Utilizing the all-electron, full-potential linear muffin-tin orbital (FP-LMTO) method.

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  • Implementing a self-consistent iterative approach for the GW Hamiltonian's eigenfunctions.
  • Achieving self-consistency in both charge density and quasiparticle spectrum.

    • Main Results:

    • Demonstrated self-consistency in charge density and quasiparticle spectrum.
    • Presented results for silicon (Si), a representative semiconductor.
    • Analyzed the electronic structure of antiferromagnetic insulators MnO and NiO.
    • Achieved excellent agreement between calculated properties and experimental data.

    Conclusions:

    • The proposed self-consistent GW approximation offers a preferred approach over conventional methods.
    • The Landau quasiparticle (energy band) picture is a valid description even for correlated materials.
    • The FP-LMTO based self-consistent GW method shows high accuracy for diverse material types.