Transferable next-generation force fields from simple liquids to complex materials.

Area of Science:

• Computational Chemistry
• Physical Chemistry
• Materials Science

Background:

• Molecular simulations are crucial for understanding chemical systems, bridging microscopic and macroscopic properties.
• Current force fields often rely on empirical parametrization, limiting accuracy and transferability across different conditions.
• Accurate description of intermolecular interactions is key to reliable molecular simulations.

Purpose of the Study:

• To develop a novel approach for creating accurate and transferable force fields from first-principles electronic structure calculations.
• To ensure force fields accurately represent the fundamental physical components of intermolecular interactions.
• To demonstrate the applicability of this method to various chemical systems.

Main Methods:

• Developed physically motivated force fields using first-principles electronic structure calculations.
• Employed intermolecular perturbation theory and energy decomposition analysis.
• Validated the approach on diverse systems, including liquids and metal-organic frameworks.

Main Results:

• Physically motivated force fields demonstrate high accuracy and transferability.
• The method successfully captures the essential physics of intermolecular interactions.
• Three-body dispersion and exchange energies were found crucial for quantitative accuracy in bulk liquids.

Conclusions:

• First-principles, physically motivated force fields offer a significant improvement over traditional empirical methods.
• This approach enables emergent structural, thermodynamic, and dynamic properties without explicit bulk property parametrization.
• The methodology provides a robust framework for advancing molecular simulations in chemistry and materials science.