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Using force-matching to reveal essential differences between density functionals in ab initio molecular dynamics

Sergei Izvekov1, Jessica M J Swanson

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|May 24, 2011
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Summary
This summary is machine-generated.

Systematic errors in ab initio Car-Parrinello Molecular Dynamics (CPMD) simulations of water can be reduced by optimizing exchange-correlation (XC) functionals and electronic fictitious mass (μ). This study analyzes effective interactions to understand simulation differences, yielding improved water models.

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Area of Science:

  • Computational chemistry
  • Condensed matter physics
  • Materials science

Background:

  • Ab initio Car-Parrinello Molecular Dynamics (CPMD) simulations are crucial for studying condensed-phase systems.
  • Systematic errors in CPMD often stem from the choice of exchange-correlation (XC) functional and the electronic fictitious mass (μ).
  • These errors significantly impact the accuracy of simulated structural and dynamic properties, particularly for liquid water.

Purpose of the Study:

  • To identify the sources of discrepancies in liquid water properties simulated using different XC functionals (BLYP, HCTH/120) and electronic fictitious mass (μ) values.
  • To analyze effective pairwise atom-atom interactions derived from CPMD simulations.
  • To develop accurate, empirically parameterized interaction models for water based on ab initio calculations.

Main Methods:

  • Utilized ab initio Car-Parrinello Molecular Dynamics (CPMD) simulations with BLYP and HCTH/120 XC functionals and varying electronic fictitious mass (μ).
  • Employed the force-matching (FM) algorithm to map CPMD-derived interactions into non-polarizable, empirical potentials.
  • Derived effective interaction models for BLYP-340, BLYP-1100, and HCTH-340 simulation ensembles.

Main Results:

  • The BLYP-340 simulation yielded an overstructured water model with slow dynamics.
  • Both BLYP-1100 and HCTH-340 simulations produced radial distribution functions in good agreement with experimental data.
  • Differences between BLYP-340 and HCTH-340 potentials were primarily in short-ranged nonbonded interactions, while BLYP-340 vs. BLYP-1100 differences were mainly in long-ranged electrostatics.

Conclusions:

  • The force-matching method effectively characterizes different simulation ensembles and aids in understanding sources of error.
  • Optimizing XC functionals and electronic fictitious mass is critical for accurate CPMD simulations of water.
  • Analytical representations of the derived effective water interaction models are provided for easy implementation.