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Relaxed core projector-augmented-wave method.

M Marsman¹, G Kresse

¹Institut für Materialphysik, Universität Wien, Sensengasse 8/12, A-1090 Vienna, Austria. martijn.marsman@univie.ac.at

The Journal of Chemical Physics

|September 27, 2006

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This study introduces a new computational method for materials science, enhancing the projector-augmented-wave approach by including core electron behavior. This improves accuracy in predicting material properties and chemical reactions.

Area of Science:

Computational materials science
Condensed matter physics
Quantum chemistry

Background:

The projector-augmented-wave (PAW) method is a powerful tool for electronic structure calculations.
The frozen core approximation in PAW methods simplifies calculations but can limit accuracy for certain properties.

Purpose of the Study:

To extend the full-potential projector-augmented-wave (FP-PAW) method beyond the frozen core approximation.
To enable self-consistent optimization of core charge density while maintaining valence wave function orthogonality.
To improve the accuracy of electronic structure calculations for a range of material properties.

Main Methods:

Developed an on-the-fly repseudization technique for the all-electron problem.
Incorporated self-consistent core charge density optimization within a spherical approximation.

Related Experiment Videos

Kept projector functions fixed during electronic minimization and derived new pseudopartial waves iteratively.

Main Results:

Presented results for relaxed core calculations.
Calculated atomic interconfigurational energies and structural energy differences for iron (Fe).
Determined atomization energies for a subset of the G2-1 chemical set and Rh 3d surface core level shifts for a rhodium (Rh) surface with CO coverage.

Conclusions:

The extended FP-PAW method provides a more accurate treatment of core electron effects.
This advancement allows for more precise predictions of material properties, including surface phenomena.
The method is validated by its application to diverse chemical and physical systems.