A periodic charge-dipole electrostatic model. II. A kinetic-exchange-correlation correction

Area of Science:

• Computational chemistry
• Condensed matter physics
• Quantum mechanics

Background:

• The periodic charge-dipole electrostatic model provides a framework for understanding material responses.
• Accurate modeling of electronic properties requires incorporating kinetic, exchange, and correlation effects.

Purpose of the Study:

• To extend the existing electrostatic model by incorporating a kinetic-exchange-correlation (KXC) correction.
• To develop a computationally efficient method for calculating KXC corrections.
• To validate the enhanced model's accuracy in describing electrostatic perturbations.

Main Methods:

• Approximation of the KXC correction using an extended-Hückel-type formula.
• Calculation of overlap integrals for computational efficiency.
• Testing the model on silver slabs subjected to external electrostatic fields.

Main Results:

• The KXC correction significantly improves the description of induced dipoles and charge density profiles.
• The model accurately captures the linear response of silver slabs to electrostatic perturbations.
• KXC parameters demonstrate transferability and correlation with atomic polarizability.

Conclusions:

• The extended periodic charge-dipole model with KXC correction offers a highly accurate and efficient approach for electrostatic modeling.
• The KXC correction is crucial for precise predictions of electronic response in materials.
• The transferability of KXC parameters suggests broader applicability across different systems.