DFT with Quantum ESPRESSO

Use this bundled example-plus-layout pattern as the reference:

• generated QE input example: assets/pw-water-0.in
• user-provided structure staging pattern: openclaw_input/ containing files such as structure.xyz and CELL

Treat this as the canonical pattern for what the user is expected to provide and what this skill is expected to generate.

The structure format does not need to be fixed to xyz. If the user provides another reasonable atomistic structure format, convert or normalize it as needed. When format conversion is needed, use the dpdata-cli skill.

For periodic systems, ensure cell information is preserved. If a plain xyz file is used, cell data must be provided separately, for example through a CELL file.

For a concrete file-oriented workflow, see references/commands-and-workflow.md.

Expected workflow

1. Start from a user-provided structure.
2. Normalize the structure into the task layout if needed.
3. Determine the target QE calculation type.
4. Collect only the missing critical DFT parameters.
5. Generate the QE input file.
6. Place the generated task in a runnable task directory.
7. If submission is requested, pass that directory to dpdisp-submit.

DFT parameters to collect

Must provide

Do not generate a formal QE task unless these are known or explicitly confirmed:

• calculation
• input_dft
• ecutwfc
• pseudo_dir
• pseudopotential file for each element

Usually should be explicit

These should normally be confirmed rather than guessed:

• vdw_corr when dispersion may matter
• ecutrho when relevant to the pseudopotential family or workflow
• K_POINTS setting, for example gamma or an automatic mesh
• occupation / smearing settings for metallic or ambiguous systems
• conv_thr
• electron_maxstep

Task-specific additions

Also collect task-dependent parameters when relevant.

For relax / vc-relax:

• forc_conv_thr
• etot_conv_thr
• cell_dofree for vc-relax

For md:

• nstep
• dt
• ion_temperature
• tempw
• ion_dynamics

For spin-polarized or magnetic systems:

• nspin
• starting_magnetization
• charge or spin-related settings if requested

For advanced workflows if explicitly requested:

• Hubbard U settings
• hybrid-functional settings
• electric field settings such as edir, emaxpos, or related controls

Do not ask for everything at once; ask only for the missing essentials.

Required behavior

1. Inspect the provided structure if accessible.
2. Determine elements, cell information, and coordinate representation.
3. If format normalization is needed, convert the structure using dpdata-cli.
4. Confirm the QE task type.
5. Gather only the missing critical DFT settings.
6. Generate the QE input yourself.
7. Explain assumptions clearly.
8. Flag unresolved scientific choices instead of hiding them.
9. Prepare the task directory so another skill can submit it.

Template pattern

Use the QE example input included in this repository:

assets/pw-water-0.in

as the reference pattern for how a QE task is organized and how the pw.x input is laid out.

In this workflow:

• the user provides the structure in openclaw_input-style form
• this skill generates the QE input task, analogous to files like assets/pw-water-0.in
• a separate submission skill handles the job script and submission stage

Do not hard-code the example chemistry. Reuse only the workflow pattern.

Defaulting policy

Allowed only for low-risk, clearly labeled assumptions.

Reasonable provisional defaults:

• calculation='scf' for a plain single-point request
• standard electronic convergence threshold when the user does not care
• basic verbosity settings

Do not silently invent:

• structure data
• pseudopotential filenames
• production cutoffs
• production k-point meshes
• magnetic state for open-shell systems
• Hubbard / vdW / hybrid settings
• metallic smearing behavior when the system character is unclear

Expected output

Provide:

1. the full QE input file
2. a short summary of the chosen settings
3. explicit assumptions
4. any decisions the user should still confirm
5. the generated task directory or file set for the next skill
6. if submission is requested, explicitly say the next step is dpdisp-submit

Minimal pw.x structure

&CONTROL
  calculation = 'scf'
  prefix = 'system'
  outdir = './'
/
&SYSTEM
  ibrav = 0
  nat = ...
  ntyp = ...
  ecutwfc = ...
  ecutrho = ...
/
&ELECTRONS
  conv_thr = 1.0d-8
/
ATOMIC_SPECIES
...
CELL_PARAMETERS angstrom
...
ATOMIC_POSITIONS angstrom
...
K_POINTS automatic
kx ky kz 0 0 0

Handoff rule

When the user asks to submit the generated QE task, do not implement submission logic here. Instead:

• finish generating the QE task directory and input file
• tell the user the task is ready for submission
• hand off to dpdisp-submit

Common failure points

• missing user-provided structure
• missing cell for periodic systems
• incomplete pseudopotential mapping
• nat / ntyp inconsistent with the structure
• missing or poor cutoffs
• missing or inappropriate smearing
• omitted spin settings for magnetic cases
• requesting post-processing or phonons without prerequisite context