Correlation functional in screened-exchange density functional theory procedures.

Area of Science:

• Computational chemistry
• Quantum chemistry
• Materials science

Background:

• Screened-exchange density functional theory (SX-DFT) methods are crucial for accurate electronic structure calculations.
• The HSE06 functional is a widely used benchmark for SX-DFT performance.
• Further development of SX-DFT is needed to enhance its accuracy and applicability.

Purpose of the Study:

• To explore advancements in screened-exchange density functional theory (SX-DFT) procedures.
• To evaluate the performance of alternative correlation functionals within SX-DFT.
• To introduce and assess novel HSEB-type SX-DFT methods.

Main Methods:

• Systematic evaluation of screened-exchange density functional theory (SX-DFT) methods.
• Comparison of HSE06 performance with alternative correlation functionals.
• Testing of new HSEB-type SX-DFT methods incorporating HSEx exchange and reparametrized B97c correlation functionals.

Main Results:

• Alternative correlation functionals provide adequate results for thermochemical properties.
• New HSEB-type SX-DFT methods perform comparably to or better than existing HSE-type procedures.
• Reparametrized B97c correlation functional shows effectiveness in HSEB-type methods.

Conclusions:

• The study identifies promising directions for the development of advanced SX-DFT methods.
• HSEB-type methods represent a viable improvement over current SX-DFT approaches.
• Fundamental analysis of correlation functionals guides future SX-DFT advancements.