Siesta: Recent developments and applications.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Computational Chemistry

Background:

• Siesta has been a key tool for materials simulation since the mid-1990s.
• Its core methodology combines pseudo-atomic orbitals, pseudopotentials, and real-space grids.
• Free distribution has enabled widespread adoption in academic and research groups.

Purpose of the Study:

• To review the current status and recent advancements of the Siesta program.
• To highlight the expanded applicability and new features of Siesta.
• To discuss future developments and ongoing research directions.

Main Methods:

• Utilizes finite-support pseudo-atomic orbitals as basis sets.
• Employs norm-conserving pseudopotentials for accurate electronic structure.
• Represents charge density and potentials on a real-space grid.

Main Results:

• Significant enhancements include spin-orbit interaction, advanced DFT functionals (DFT+U, hybrid), and time-dependent DFT.
• New capabilities cover ballistic electron transport and efficient van der Waals functionals.
• Improved interoperability with tools like wannier90 and AiiDA facilitates complex workflows.

Conclusions:

• Siesta continues to evolve, offering state-of-the-art computational materials science capabilities.
• The open-source model and enhanced features promote broader accessibility and application.
• Ongoing developments promise further advancements in electronic structure modeling and simulation.