Spin-Unrestricted Self-Energy Embedding Theory.

Area of Science:

• Quantum Chemistry
• Theoretical Chemistry
• Computational Chemistry

Background:

• Electron exchange between embedded systems and environments is crucial in chemistry.
• Existing methods face computational bottlenecks, especially for open-shell and strongly correlated systems.

Purpose of the Study:

• Introduce unrestricted self-energy embedding theory (USEET) as a new Green's function embedding approach.
• Address limitations of current methods for open and strongly correlated systems.
• Demonstrate USEET's applicability to systems with an odd number of electrons.

Main Methods:

• Developed a novel Green's function embedding theory named USEET.
• Applied USEET to model electron exchange in open, embedded systems.
• Compared USEET results with established quantum chemistry techniques.

Main Results:

• USEET provides accurate results comparable to standard quantum chemistry methods.
• The new theory effectively handles systems with an odd number of electrons.
• USEET circumvents computational bottlenecks inherent in other approaches.

Conclusions:

• USEET is a promising theoretical tool for studying electron exchange in complex chemical systems.
• This method offers a computationally efficient alternative for inorganic chemistry, particularly for transition metal complexes.
• USEET advances the study of strongly correlated and open-shell systems.