A density-functional approach to polarizable models: a Kim-Gordon response density interaction potential for...

Area of Science:

• Computational chemistry
• Materials science
• Condensed matter physics

Background:

• Accurate simulation of material properties is crucial for scientific advancement.
• Existing methods often rely on empirical potentials or computationally expensive calculations.
• A need exists for efficient and accurate theoretical models.

Purpose of the Study:

• To implement and validate a novel linear-response-frozen electron-density model within a molecular-dynamics framework.
• To assess the model's ability to reproduce experimental properties of alkali halides.
• To provide an accurate and efficient alternative to existing computational methods.

Main Methods:

• Developed a molecular-dynamics scheme using an extended Lagrangian formalism.
• Partitioned electron density into frozen (Kim-Gordon theory) and response components.
• Parametrized the model using subsystem calculations, avoiding empirical pair potentials.

Main Results:

• Successfully applied the method to alkali halides in various physical phases.
• Reproduced experimental structural and thermodynamic properties with high accuracy.
• Achieved accuracy comparable to Kohn-Sham density-functional calculations.

Conclusions:

• The combined linear-response-frozen electron-density model is a viable and accurate approach for molecular dynamics.
• This method offers a computationally efficient alternative for predicting material properties.
• The model's success with alkali halides suggests broader applicability in materials science.