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# Welcome to phonopy
**Phonopy** is an open source package for phonon calculations at harmonic and
quasi-harmonic levels.
[Phono3py](http://phonopy.github.io/phono3py/) is another open source package
for phonon-phonon interaction and lattice thermal conductivity calculations.
**PhononDB**: URL links of first principles phonon calculation data at
[nims.4197](https://doi.org/10.48505/nims.4197) are found at
<https://github.com/atztogo/phonondb/blob/main/mdr/phonondb/README.md>.
See {ref}`phonopy_yaml_phonondb`.
The following features of phonopy are highlighted:
- {ref}`Phonon band structure <band_structure_related_tags>`,
{ref}`phonon DOS and partial-DOS <dos_related_tags>`
- {ref}`Phonon thermal properties <thermal_properties_tag>`: Free energy, heat
capacity (Cv), and entropy
- {ref}`Phonon group velocity <group_velocity>`
- {ref}`Thermal ellipsoids <thermal_displacement_matrices_tag>` /
{ref}`Mean square displacements <thermal_displacements_tag>`
- {ref}`Irreducible representations of normal modes <irreducible_representation_related_tags>`
- {ref}`Dynamic structure factor for INS and IXS <dynamic_structure_factor>`
- {ref}`Non-analytical-term correction <nac_tag>`: LO-TO splitting
({ref}`Born effective charges and dielectric constant are required. <born_file>`)
- {ref}`Mode Grüneisen parameters <phonopy_gruneisen>`
- {ref}`Quasi-harmonic approximation <phonopy_qha>`: Thermal expansion, heat
capacity at constant pressure (Cp)
- {ref}`Interfaces to calculators <calculator_interfaces>`: {ref}`VASP
<vasp_interface>`, {ref}`VASP DFPT <vasp_dfpt_interface>`, {ref}`ABINIT
<abinit_interface>`, {ref}`Quantum ESPRESSO <qe_interface>`, {ref}`SIESTA
<siesta_interface>`, {ref}`Elk <elk_interface>`, {ref}`WIEN2k
<wien2k_interface>`, {ref}`CRYSTAL <crystal_interface>`, {ref}`DFTB+
<dftbp_interface>`, {ref}`TURBOMOLE <turbomole_interface>`, {ref}`CP2K
<cp2k_interface>`, {ref}`FHI-aims <FHI_aims_interface>`, {ref}`CASTEP
<castep_interface>`, {ref}`Fleur <Fleur_interface>`, {ref}`ABACUS
<abacus_interface>`, {ref}`LAMMPS <lammps_interface>`, {ref}`LAMMPS (external)
<external_tools_phonolammps>`, {ref}`Questaal/LMTO (QLM) <qlm_interface>`
- {ref}`Phonopy API for Python <phonopy_module>`
```{toctree}
:hidden:
install
symmetry
workflow
examples
input-files
output-files
setting-tags
command-options
dynamic-structure-factor
Mode Grüneisen parameters <gruneisen>
qha
random-displacements
interfaces
auxiliary-tools
external-tools
phonopy-module
phonopy-yaml
phonopy-load
mlp-sscha
formulation
citation
reference
changelog
```
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documentation
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(mailinglist)=
## Mailing list
For questions, bug reports, and comments, please visit
<https://lists.sourceforge.net/lists/listinfo/phonopy-users> to subscribe the
phonopy mailing list and send them to <phonopy-users@lists.sourceforge.net>.
Message body including attached files has to be smaller than 300 KB.
## License
New BSD from version 1.3.
(LGPL from ver. 0.9.3 to version 1.2.1., GPL to version 0.9.2.)
## Contributors
- Atsushi Togo, National Institute for Materials Science
## Acknowledgements
Phonopy development is supported by:
- National Institute for Materials Science
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