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Related Experiment Videos

Self-interaction and strong correlation in DFTB.

B Hourahine1, S Sanna, B Aradi

  • 1Department of Physics, University of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow G4 0NG, United Kingdom.

The Journal of Physical Chemistry. A
|June 8, 2007
PubMed
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Charge-self-consistent DFTB (SCC-DFTB) is shown to have a defined ground state. New methods improve SCC-DFTB accuracy for electronic structure calculations, particularly for the NiO system.

Area of Science:

  • Computational Chemistry
  • Condensed Matter Physics
  • Quantum Chemistry

Background:

  • Density Functional Theory (DFT) offers advancements for Density Functional based Tight-Binding (DFTB) methods.
  • DFTB provides a platform for testing new DFT extensions.
  • Charge-self-consistent DFTB (SCC-DFTB) is a valuable computational tool.

Purpose of the Study:

  • To demonstrate the variational nature and ground-state existence in SCC-DFTB.
  • To present improved functionals for SCC-DFTB, addressing limitations in describing electronic properties.
  • To introduce novel methods for enhancing the accuracy of SCC-DFTB calculations.

Main Methods:

  • Demonstration of the variational nature of SCC-DFTB.
  • Application of recent LDA+U functionals within the SCC-DFTB framework.

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  • Development of a semilocal self-interaction correction scheme.
  • Introduction of a novel method to address derivative discontinuities.

    • Main Results:

    • Proof of a defined ground-state for SCC-DFTB methods.
    • Successful implementation of LDA+U functionals, including a new self-interaction correction.
    • Development of a method for exact derivative discontinuities at low computational cost.
    • Illustration of these developments using the NiO system.

    Conclusions:

    • SCC-DFTB possesses a defined ground state, validating its theoretical foundation.
    • The presented LDA+U functionals and correction schemes significantly enhance the accuracy of SCC-DFTB.
    • Novel methods effectively introduce crucial physical properties like derivative discontinuities, improving electronic structure predictions.