VASP

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The Vienna Ab initio Simulation Package is a computer program for atomic scale materials modelling.

Overview

VASP, the Vienna Ab initio Simulation Package, is one of the materials science packages available on RCC. It is a materials modeling software designed for modeling materials at the atomic scale. VASP is capable of doing electronic structure calculations as well as quantum molecular dynamics.

VASP's main purpose is to solve the many-body Schrödinger Equation numerically using one of several different available approximations including a DFT approach using the Kohn-Sham Equations or a Hartree-Fock approach using the Roothaan equations. There are also hybrid methods combining the two approaches available in VASP as well. VASP also contains functionality for Green's Functions methods as well as many-body perturbation theory methods.

License

VASP is a licensed software. If your group has bought a license granting you access to it, you can contact RCC to be included in the group vaspgroup.

Using VASP

The VASP at RC is compiled using the intel openmpi compiler. To use vasp, you need first to load the module vasp

module load vasp

    After that you can find the executables called

    vasp_gam
vasp_ncl
vasp_std

    in the following directory

    /gpfs/research/software/hpc/intel/openmpi/vasp/vasp.5.4.1/

    To determine the electronic groundstate, VASP makes use of efficient iterative matrix diagonalisation techniques, like the residual minimisation method with direct inversion of the iterative subspace (RMM-DIIS) or blocked Davidson algorithms. These are coupled to highly efficient Broyden and Pulay density mixing schemes to speed up the self-consistency cycle.