vasp-manager 1.3.4

A simple package to run and analyze VASP calculations

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                 |_|                             |___/ v1.3.4

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Automatically run VASP relaxation, static, bulk moduli, or elastic constant calculations

How to Install

1. Create a new environment with python version $\geq$ 3.10
2. Clone this repository
3. Run pip install -e . or optionally pip install -e .[dev] to include packages needed for development/contribution

This package is also available on PyPi. To install, run pip install vasp-manager.

User Guide

This package serves to automate VASP calculations. VASP input creation is automatic, and so is job submission, queue monitoring, calculation analysis, and storage of the results. Simply rerun the main script and any calculations that are ready for the next type of calculation will be created and submitted.

VaspManager

The main class for handling all calculations is vasp_manager.VaspManager, which takes in a list of calculation types and material paths. See the class documentation for more details. By default, results are exported to calculations/results.json.

The bulk moduli analysis is carried out in the backend using the open-source pymatgen software to fit an EOS and elastic constant analysis using custom scripts.

Calculation Modes

We include calculation modes "rlx-coarse", "rlx", "static", "bulkmod", and "elastic". The desired modes to calculate are specified when initializing a VaspManager object.

• rlx-coarse: lower precision energy-based relaxation
• rlx: tighter force-based relaxation
• static: high accuracy static SCF calculation
• bulkmod: bulk modulus calculation using an Equation of State (EOS) fit to an energy-volume curve
  • Can be run as a standalone (no relaxation required) calculation of bulk modulus using an EOS (although this is not recommended unless you are sure the cell volume is very close to the equilibrium value)
• elastic: Determination of elastic constants using the strain/deformation method built into VASP

I generally recommend starting from rlx-coarse, although the functionality is there to start a rlx calculation from the initially provided POSCAR.

Most users' workflows follow rlx-coarse → rlx → static. The modes static, bulkmod, and elastic can all be run independently of each other. For example, workflows might look like rlx-coarse → rlx → static → bulkmod, or rlx → elastic, or simply static or bulkmod. The elastic mode requires at least rlx preceding it in order to guarantee converged lattice parameters and atomic positions.

Usage Guide

In order to use this package, you MUST

1. Create a calculations folder where you'd like to run your calculations. Each subfolder of calculations/ should have a unique name and contain a POSCAR. A sample method of creating the calculations folder from a json with names and cifs is available in run_vasp_calculations.py, and an example calculations folder is provided in calculations/.
2. Configure computing_config.json and place it in the calculations/ directory. You will need to specify your user_id, a potcar_directory, a queuetype, your allocation and a vasp_module (VASP 6 strongly recommended). As of now, only Perlmutter and Bridges2 at NERSC and QUEST at Northwestern University are supported. Any other SLURM based supercomputers can be easily added, but modifications could be made for other queue management systems.
3. If desired, make modifications to calc_config.json. This must also be placed in the calculations/ directory. Each mode has its own configuration settings with sensible defaults, but these can be easily customized by the user.
   • To include spin polarization, set "ispin": "auto" in calc_config.json; otherwise set "ispin": 1. With this setting, all elements with valence d or f electrons will start with initial magnetic moments of 5 and 7 $\mu_B$, respectively. VaspManager also accepts an additional argument magmom_per_atom_cutoff which defaults to 0. If this argument is passed, rlx calculations that finish with a magmom per atom less than this value with be re-run without spin polarization. This argument only affects rlx calculations, and the spin setting for following static, bulkmod, or elastic calculations is inferred from the final rlx calculation.
   • To include DFT+U for transition metal oxides, set "hubbards": "wang"; otherwise, set "hubbards": null. Currently, only "gga": "PE" (PBE) is supported.

To manually stop VaspManager from processing a material, place a STOP file in that material's directory: e.g. calculations/NaCl/STOP.

The module logger is also made available for information and debugging and can be accessed through logging.getLogger("vasp_manager").

Notes

• The current implementation has only been tested on Linux and Mac OS.
• At this point, KPOINT generation is handled through the KSPACING tag in the INCAR, but future versions will be able to specify KPPRA or a manual grid instead. Spin-orbit coupling calculations are also not currently supported.

\\ TODO: Implement band-structure calculations and possibly phonopy calculations