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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Extending density functional embedding theory for covalently bonded systems.

Kuang Yu1, Emily A Carter2

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544-5263.

Proceedings of the National Academy of Sciences of the United States of America
|December 6, 2017
PubMed
Summary
This summary is machine-generated.

Density-matrix functional embedding theory (DMFET) offers accurate electronic energies for large quantum systems. This advanced method improves upon density functional embedding theory (DFET) for covalently bonded molecules in chemistry and biochemistry.

Keywords:
covalent bondsdensity matrixquantum embedding theory

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Materials Science

Background:

  • Quantum embedding theory provides efficient, accurate electronic energies for large quantum systems.
  • Density functional embedding theory (DFET) has shown success in metals and semiconductors.
  • Existing methods struggle with strong quantum couplings in covalently bonded subsystems.

Purpose of the Study:

  • To extend density functional embedding theory (DFET) to a density-matrix-based nonlocal form.
  • To introduce density-matrix functional embedding theory (DMFET) for studying covalently bonded systems.
  • To demonstrate DMFET's performance in chemistry and biochemistry applications.

Main Methods:

  • Development of density-matrix functional embedding theory (DMFET) from DFET.
  • Application of DMFET to systems with strong quantum couplings.
  • Testing DMFET on isomerization energies, proton transfer energies, and electronic gaps.

Main Results:

  • DMFET provides excellent results for various chemical and biochemical test cases.
  • The method accurately predicts isomerization energies, proton transfer energies, and HOMO-LUMO gaps.
  • DMFET systematically improves results compared to capped cluster models and ONIOM.

Conclusions:

  • Density-matrix functional embedding theory (DMFET) is a powerful advancement in quantum embedding.
  • DMFET enables accurate calculations for systems with strong quantum mechanical interactions.
  • DMFET offers superior performance over existing methods for complex molecular systems.