Tight-binding calculation studies of vacancy and adatom defects in graphene

Area of Science:

• Materials Science
• Computational Physics
• Condensed Matter Theory

Background:

• First-principles methods struggle with large-scale simulations of complex defects in graphene due to high computational cost.
• Understanding graphene defects is crucial for tailoring its properties for advanced applications.

Purpose of the Study:

• To introduce and validate an efficient three-center tight-binding potential for large-scale atomistic simulations of graphene defects.
• To systematically investigate the stable structures and formation energies of various vacancy and embedded-atom defects in graphene.

Main Methods:

• Development and application of a three-center tight-binding potential for carbon.
• Large-scale atomistic simulations to study defect structures and energies.
• Systematic analysis of defects ranging from single to multiple vacancies and embedded atoms.

Main Results:

• The three-center tight-binding potential demonstrates high efficiency for large-scale simulations.
• Accurate description of structures and energies for diverse graphene defects.
• Identification of low-energy configurations for vacancy and embedded-atom defects up to size four.

Conclusions:

• The developed potential offers a computationally efficient and accurate approach for studying complex graphene defects.
• The findings provide a comprehensive understanding of defect structures and stability in graphene.
• This work facilitates further research into defect engineering for graphene-based materials.