Chester 2019

Lectures

• DFT, PW, and PAW: "VASP: The basics(1). DFT, plane waves, PAW, ...".

• electronic convergence, BZ sampling: "VASP: The basics(2). electronic convergence, BZ sampling ...".

• Hybrid functionals: "VASP: Hybrid functionals".

• Dielectric properties: "VASP: Dielectric response. Perturbation theory, linear response, and finite electric fields".

• Beyond DFT: RPA: "VASP: beyond DFT. The Random-Phase-Approximation".

• Performance: "VASP: running on HPC resources".

Allocating Computing Nodes and Environment Setup

An interactive shell should be allocated after login. The following command allocates an interactive node with 8 CPUs for 4 hours

qsub -IVXl select=1:ncpus=8,walltime=4:0:0,place=scatter:excl -A y15 

After successful allocation, one has to setup the environment as follows.

To have access to the vasp binaries, the corresponding module has to be loaded into the environment. Furthermore, the job scripts found in the tutorial tar files (job.sh, doall.sh, etc) work only if the environment variables "vasp_std, vasp_gam, vasp_ncl" are defined. Enter following commands in the terminal window after login, to setup up the environment.

module load vasp
export vasp_std="mpirun -ppn 8 -np 8 /lustre/home/y07/vasp5/5.4.4-intel17-mpt214/bin/vasp_std"
export vasp_gam="mpirun -ppn 8 -np 8 /lustre/home/y07/vasp5/5.4.4-intel17-mpt214/bin/vasp_gam"
export vasp_ncl="mpirun -ppn 8 -np 8 /lustre/home/y07/vasp5/5.4.4-intel17-mpt214/bin/vasp_ncl"

Submitting jobs

Alternative to an interactive shell, one may submit jobs to the cluster as follows

qsub vasp.job

where the jobfile "vasp.job" reads

#!/bin/bash --login

#PBS -N VASP-Test
#PBS -l select=1:ncpus=36
#PBS -l place=scatter:excl
#PBS -l walltime=00:30:00
#PBS -A y15 

cd $PBS_O_WORKDIR 
module load vasp
mpiexec_mpt -ppn 36 -n 36 vasp_std | tee vasp.out

Tutorials

For the beginners: A short introduction to the common Input and Output files.

• Atoms and Molecules
• Simple Bulk Systems
• A bit of Surface Science
• Hybrid Functionals
• Optical Properties and Dielectric Response
• The Random-Phase-Approximation: GW and ACFDT
• The Bethe-Salpeter equation
• Magnetism

Further Examples

Nudge Elastic Band Method and (constrained) Molecular Dynamics

• Liquid Si - Standard MD

• Transition State Search of Ammonia

• Adsorption of H2O on TiO2

Magnetism in NiO

• NiO GGA

• NiO GGA+U

• NiO HSE06

• Estimation of J magnetic coupling

• Including the Spin-Orbit Coupling

• Determining the Magnetic Anisotropy

• Constraining the local magnetic moments

NMR calculations

• alpha-SiO2

• alpha-AlF3