High-Quality Local Pseudopotentials for Metals | JoVE Visualize

Area of Science:

Computational materials science
Quantum chemistry
Condensed matter physics

Background:

Orbital-free density functional theory (OF-DFT) offers computational efficiency for materials simulations.
Accurate local pseudopotentials (LPSs) are essential for OF-DFT, but high-quality LPSs for all metals, particularly transition metals, are lacking.
Existing LPSs often struggle to accurately represent the electronic structure of transition metals.

Purpose of the Study:

To develop high-quality local pseudopotentials (LPSs) applicable to all simple and transition metals for orbital-free density functional theory (OF-DFT).
To address the challenge of fitting both semicore and outermost valence orbitals in transition metals within the constraints of local pseudopotentials.
To enhance the applicability of OF-DFT for magnetic materials and alloys by incorporating spin-polarization effects.

Main Methods:

Developed LPSs by fitting atomic eigenvalues and orbital norms beyond cutoff radii for simple and transition metals.
Overcame fitting challenges for transition metals by excluding semicore orbitals from optimization, focusing on outermost valence orbitals crucial for bonding.
Introduced atomic spin-polarization energy as a metric for constructing LPSs for magnetic systems.

Main Results:

Achieved excellent fittings of outermost valence orbitals, satisfying norm-conserving conditions for high-quality LPSs.
Successfully developed LPSs for all simple and transition metals.
Demonstrated that LPSs for magnetic systems reasonably reproduced properties of magnetic metals and alloys when incorporating spin-polarization energy.

Conclusions:

The developed high-quality LPSs significantly advance the application of OF-DFT to all metals and their alloys.
These LPSs pave the way for large-scale, reliable OF-DFT simulations, overcoming a major computational bottleneck.
The methodology provides a robust framework for generating accurate pseudopotentials for diverse metallic systems, including magnetic ones.