The ONETEP linear-scaling density functional theory program.

Area of Science:

• Computational Chemistry
• Materials Science
• Quantum Mechanics

Background:

• Density Functional Theory (DFT) is crucial for electronic structure calculations.
• Large-scale systems pose significant computational challenges for traditional DFT methods.

Purpose of the Study:

• To provide an overview of the onetep program for linear-scaling DFT.
• To highlight its capabilities for accurate simulations of large, complex systems.

Main Methods:

• Utilizes Non-orthogonal Generalized Wannier Functions (NGWFs) expressed in periodic sinc (psinc) functions.
• Optimizes density matrix and NGWFs with localization constraints for linear scaling.
• Employs parallel computing for efficient calculations on large systems.

Main Results:

• Achieves linear scaling of computational effort with system size (thousands of atoms).
• Demonstrates a wide range of capabilities including various functionals, boundary conditions, and advanced simulation techniques.
• Provides accurate atomic-level insights for biomolecular, chemical, materials, and physical problems.

Conclusions:

• onetep is a powerful tool for electronic structure simulations of large and complex systems.
• It serves as a platform for developing novel methods in computational quantum mechanics.
• Future developments will focus on expanding its capabilities and applications.