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Van der Waals density functional for layered structures.

H Rydberg1, M Dion, N Jacobson

  • 1Department of Applied Physics, Chalmers University of Technology and Göteborg University, SE-412 96 Göteborg, Sweden.

Physical Review Letters
|October 4, 2003
PubMed
Summary
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A fully nonlocal density-functional theory (DFT) approach is essential for accurately modeling sparse materials. Standard DFT approximations fail for these systems, highlighting the need for nonlocal methods to capture van der Waals forces.

Area of Science:

  • Materials Science
  • Computational Chemistry
  • Condensed Matter Physics

Background:

  • Sparse materials, like graphite, boron nitride, and molybdenum sulfide, feature both strong local bonds and weak nonlocal van der Waals forces.
  • Accurate modeling of these systems is crucial for understanding their properties and potential applications.

Purpose of the Study:

  • To evaluate the effectiveness of a fully nonlocal functional form of density-functional theory (DFT) for sparse systems.
  • To compute key material properties including bond lengths, binding energies, and compressibilities.

Main Methods:

  • Application of a fully nonlocal functional form of density-functional theory (DFT).
  • Computational analysis of layered materials: graphite, boron nitride, and molybdenum sulfide.

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Main Results:

  • The generalized-gradient approximation (GGA) of DFT inaccurately predicts properties of sparse matter.
  • The fully nonlocal DFT functional successfully models sparse systems, yielding accurate bond lengths, binding energies, and compressibilities.

Conclusions:

  • Standard DFT approximations are inadequate for sparse materials due to their reliance on nonlocal interactions.
  • A fully nonlocal DFT approach is a viable and accurate method for studying the properties of sparse matter.