VASP

The Vienna Ab initio Simulation Package (VASP) is a widely used, high-performance computer program for atomic-scale materials modeling and electronic structure calculations. It enables simulations of quantum-mechanical molecular dynamics, materials properties, and electronic ground states, commonly used for research in physics and chemistry. 

Key Aspects of VASP:

• Applications: Used to determine bonding nature, phase energy, mechanical properties (e.g., bulk modulus), optical absorption, and defect formation energy.

• Methodology:
  Solves the many-body Schrödinger equation using density functional theory (DFT), hybrid functionals, or post-DFT methods.

• Input Files: Requires four primary files: POSCAR (structure), INCAR (parameters), POTCAR (potentials), and KPOINTS (k-point grid).

• Execution: Runs on high-performance computing (HPC) clusters, often utilizing MPI for parallelization and supporting GPU acceleration for faster calculations.

• Tools: The py4vasp Python package can be used to interface with the code and analyze output files like OUTCAR.

• Licensing: VASP is a licensed, commercial software