The full potential Korringa-Kohn-Rostoker method and its application in electric field gradient calculations

Area of Science:

• Condensed matter physics
• Computational materials science
• Quantum mechanics

Background:

• Accurate electronic structure calculations are crucial for understanding material properties.
• Previous Korringa-Kohn-Rostoker (KKR) methods had limitations in fully incorporating non-spherical potentials.
• Electric field gradients (EFGs) are sensitive probes of local electronic environments.

Purpose of the Study:

• To develop and validate an efficient full potential Korringa-Kohn-Rostoker (KKR) Green function method.
• To improve the practical application of KKR methods in electronic structure calculations.
• To assess the reliability of the developed method for calculating electric field gradients (EFGs).

Main Methods:

• Developed a full potential KKR Green function method with three key improvements.
• Implemented a novel Green function construction satisfying the Wronskian relation.
• Incorporated non-spherical potential contributions using a modified recursive integral equation.
• Introduced a method to eliminate irregular solutions' impact on charge/spin densities.

Main Results:

• The developed full potential KKR method is efficient and practical.
• Calculated electric field gradients (EFGs) show excellent agreement with experimental data.
• Demonstrated reliability for EFG calculations in hexagonal close-packed (hcp) metals and sp impurities in Zn and Cd.

Conclusions:

• The enhanced full potential KKR Green function method provides accurate EFG calculations.
• The method's improvements lead to reliable and practical electronic structure analysis.
• This approach advances computational materials science for predicting material properties.