phonopy

Compute phonon spectra, DOS, and thermodynamic data from DFT forces.

181|20|Updated Apr 29, 2026

Search Tags:#band-structure #dos #thermodynamics #phonopy #dft #phonons #vibrational-properties

Ready to run

npx skills add https://github.com/Hello-QM/catgo-LRG --skill phonopy-hello-qm

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: phonopy
Source: https://github.com/Hello-QM/catgo-LRG/tree/main/.claude/skills/phonopy
Command: npx skills add https://github.com/Hello-QM/catgo-LRG --skill phonopy-hello-qm

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Phonopy enables automated vibrational analysis by performing finite-displacement phonon calculations to obtain phonon spectra, DOS, and thermodynamic properties for materials.

Core Features & Use Cases

Phonon band structure calculations and phonon DOS for materials
Thermodynamic properties derived from phonons (heat capacity, entropy, free energy)
Dynamical stability checks and analysis of imaginary modes
Compatibility with common DFT codes (VASP, QE, ABINIT) through force calculations on displaced structures

Quick Start

Run Phonopy on a fully relaxed structure to generate phonon properties.

Frequently Asked Questions about phonopy

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I calculate phonon band structure and DOS from a relaxed crystal structure?▼

To calculate phonon band structure and DOS, Phonopy applies a finite-displacement method to a fully relaxed structure, generating displaced supercells for a compatible DFT code to compute the forces required for vibrational analysis.

Can I use Phonopy with DFT codes other than VASP?▼

Yes, Phonopy is compatible with common DFT codes including VASP, QE, and ABINIT, requiring force calculations on the displaced supercells generated by the workflow to derive vibrational properties.

How do I check the dynamical stability of a material using phonon calculations?▼

You can check dynamical stability by computing the phonon spectra to identify imaginary modes, which indicate structural instability in the relaxed material.

What thermodynamic properties can I derive from phonon calculations?▼

Phonon calculations yield thermodynamic data including heat capacity, entropy, and free energy, derived from the vibrational properties of the material.

Do I need a fully relaxed structure before computing vibrational properties?▼

Yes, you must provide a fully relaxed structure generated by a DFT code before computing vibrational properties, as the finite-displacement workflow depends on accurate baseline atomic positions.

Why does my phonon calculation require force calculations on displaced supercells?▼

The finite-displacement method requires force calculations on displaced supercells to numerically construct the dynamical matrix, which is then solved to obtain phonon spectra and thermodynamic data.