Many-Body Green's Function Theory for Electronic Excitations in Complex Chemical Systems

Area of Science:

• Computational Chemistry
• Materials Science
• Quantum Mechanics

Background:

• The GW method and Bethe-Salpeter equation (BSE) are established techniques for electronic excitation calculations.
• Previous studies confirm their high precision, comparable to advanced ab initio methods.
• They offer a significant reduction in computational cost.

Purpose of the Study:

• To provide an overview of the GW method and BSE.
• To highlight their applications in complex chemical systems.
• To encourage wider adoption of these methods in chemistry.

Main Methods:

• Utilizing the GW method for electronic structure calculations.
• Employing the Bethe-Salpeter equation (BSE) for electronic excitations.
• Applying first-principles approaches to periodic systems and interfaces.

Main Results:

• GW and BSE achieve high accuracy in computing charged and neutral electronic excitations.
• These methods outperform density functional theory for electronic structure and excitation treatment.
• They are uniquely capable of accurately studying excitations at surfaces, in bulk, and at interfaces.

Conclusions:

• The GW method and BSE are powerful, accurate, and computationally efficient tools for electronic excitation calculations.
• Their ability to handle diverse excitation types and system complexities makes them invaluable.
• Broader utilization in chemistry is encouraged for advancing materials and chemical system understanding.