AiiDA plugin that simplifies working with pseudo potentials
AiiDA plugin that simplifies working with pseudopotentials.
The easiest way of getting started using
aiida-pseudo is to use the command line interface that ships with it.
For example, to install a configuration of the SSSP, just run:
aiida-pseudo install sssp
The version, functional, and protocol can be controlled with various options; use
aiida-pseudo install sssp --help to see their description.
If you are experiencing problems with this automated install method, see the Troubleshooting section below for help.
Installed pseudopotential families can be listed using:
Any pseudopotential family installed can be loaded like any other
Group using the
load_group utility from
Once loaded, it is easy to get the pseudopotentials for a given element or set of elements:
from aiida.orm import load_group family = load_group('SSSP/1.1/PBE/efficiency') pseudo = family.get_pseudo(element='Ga') # Returns a single pseudo pseudos = family.get_pseudos(elements=('Ga', 'As')) # Returns a dictionary of pseudos where the keys are the elements
If you have a
StructureData node, the
get_pseudos method also accepts that as an argument to automatically retrieve all the pseudopotentials required for that structure:
structure = load_node() # Load the structure from database or create one pseudos = family.get_pseudos(structure=structure)
If you use
pseudos dictionary returned by
get_pseudos can be directly used as an input for
The plugin is centered around two concepts: pseudopotentials and pseudopotential families.
The two concepts are further explained below, especially focusing on how they are implemented in
aiida-pseudo, what assumptions are made, and what the limitations are.
Pseudopotentials are implemented as data plugins, and the base class is
Pseudopotentials are assumed to be defined by a single file on disk and represent a single chemical element.
As such, each pseudopotential node, has to have two attributes: the md5 of the file that it represents and the symbol of chemical element that the pseudopotential describes.
The latter follows IUPAC naming conventions as used in the module
PseudoPotentialData functions as a base class and does not represent an actual existing pseudopotential format.
It is possible to create a family of
PseudoPotentialData nodes, but since the element cannot be parsed from the file content itself, it will have to be done from the filename, so the filename has to have the format
CHEMICAL_SYMBOL.EXTENSION, for example
PseudoPotentialData class does not have any features tailored to specific formats, as do the classes which inherit from it (e.g.
UpfData for UPF-formatted pseudopotentials), this class is mostly useful for development.
The plugin comes with a variety of pseudopotential subtypes that represent various common pseudopotential formats, such as UPF, PSF, PSML and PSP8. The corresponding data plugins implement how the element and other data are parsed from a pseudopotential file with such a format. A new pseudopotential node can be created by instantiating the corresponding plugin class:
from aiida import plugins UpfData = plugins.DataFactory('pseudo.upf') with open('path/to/pseudo.upf', 'rb') as stream: pseudo = UpfData(stream)
Note, the pseudopotential constructor expects a stream of bytes, so be sure to open the file handle with the
Alternatively, you can also use the
get_or_create classmethod, which will first search the database to check if a pseudopotential of the exact same type and content already exists.
If that is the case, that node is returned, otherwise a new instance is created:
from aiida import plugins UpfData = plugins.DataFactory('pseudo.upf') with open('path/to/pseudo.upf', 'rb') as stream: pseudo = UpfData.get_or_create(stream)
If a new node was created, it will be unstored. Note that if more than one pseudopotential in the database is matched, a random one is selected and returned.
Having loose pseudopotentials floating around is not very practical, so groups of related pseudopotentials can be organized into "families", which are implemented as group plugins with the base class
A family class can in principle support many pseudopotential formats, however, a family instance can only contain pseudopotentials of a single format.
For example, the
PseudoPotentialFamily class supports all of the pseudopotential formats that are supported by this plugin.
However, any instance can only contain pseudopotentials of the same format (e.g. all UPF or all PSP8, not a mixture).
In contrast, the
SsspFamily only supports the
A pseudopotential family can be constructed manually, by first constructing the class instance and then adding pseudopotential data nodes to it:
from aiida import plugins UpfData = plugins.DataFactory('pseudo.upf') PseudoPotentialFamily = plugins.GroupFactory('pseudo') pseudos =  for filepath in ['Ga.upf', 'As.upf']: with open(filepath, 'rb') as stream: pseudo = UpfData(stream) pseudos.append(pseudo) family = PseudoPotentialFamily(label='pseudos/upf').store() family.append(pseudos)
Note that as with any
Group, it has to be stored before nodes can be added.
If you have a folder on disk that contains various pseudopotentials for different elements, there is an even easier way to create the family automatically:
from aiida import plugins UpfData = plugins.DataFactory('pseudo.upf') PseudoPotentialFamily = plugins.GroupFactory('pseudo') family = PseudoPotentialFamily('path/to/pseudos', 'pseudos/upf', pseudo_type=UpfData)
The plugin is not able to reliably deduce the format of the pseudopotentials contained in the folder, so one should indicate what data type to use with the
The exception is when the family class only supports a single pseudo type, such as for the
SsspFamily, in which case that type will automatically be selected.
Subclasses of supported pseudo types are also accepted.
For example, the base class
PseudoPotentialFamily supports pseudopotentials of the
Because all more specific pseudopotential types are subclasses of
PseudoPotentialFamily class accepts all of them.
Certain pseudopotential family types, such as the
SsspFamily, provide recommended cutoff values for wave functions and charge density in plane-wave codes.
These cutoffs are always in units of electronvolt.
The recommended cutoffs for a set of elements or a
StructureData can be retrieved from the family as follows:
family = load_group('SSSP/1.1/PBE/efficiency') cutoffs = family.get_recommended_cutoffs(elements=('Ga', 'As')) # From a tuple or list of element symbols cutoffs = family.get_recommended_cutoffs(structure=load_node(<IDENTIFIER>)) # From a `StructureData` node
The automated install commands fail
These failures are often due to unstable internet connections causing the download of the pseudopotential archive from the web to fail. In this case, it is possible to install the family manually from an archive that is already available on the local file system. To install a pseudopotential family manually, run the following command:
aiida-pseudo install family <ARCHIVE> <LABEL>
<ARCHIVE> should be replaced with the pseudopotential archive and
<LABEL> with the label to give to the family.
The command will attempt to automatically detect the compression format of the archive.
If this fails, you can specify the format manually with the
--archive-format/-F option, for example, for a
aiida-pseudo install family <ARCHIVE> <LABEL> -F gztar
By default, the command will create a family of the base pseudopotential family type.
If you want to create a more specific family, for example an
SsspFamily, or a
PseudoDojoFamily, you can provide the corresponding entry point to the
aiida-pseudo install family <ARCHIVE> <LABEL> -T pseudo.family.sssp
aiida-pseudo install family <ARCHIVE> <LABEL> -T pseudo.family.pseudo_dojo
The available pseudopotential family classes can be listed with the command:
verdi plugin list aiida.groups
Any entry point that starts with
pseudo.family. can potentially be used, depending on the type of pseudopotential archive.
|The functionality of some plugins, such as the workflow protocols of
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
|Filename, size||File type||Python version||Upload date||Hashes|
|Filename, size aiida_pseudo-0.6.0-py3-none-any.whl (67.1 kB)||File type Wheel||Python version py3||Upload date||Hashes View|
|Filename, size aiida-pseudo-0.6.0.tar.gz (50.8 kB)||File type Source||Python version None||Upload date||Hashes View|
Hashes for aiida_pseudo-0.6.0-py3-none-any.whl