This is a bounded real-execution case for the same CC0 COD 9013102 Silicon structure used by the other Silicon pages. Quantum ESPRESSO 7.5 pw.x first converged an 8×8×8 fixed-geometry SCF state; ph.x then ran at Γ with epsil = .true. using the same prefix/outdir lineage. The committed output contains the electronic/ion-clamped dielectric tensor, raw and acoustic-sum-rule-adjusted Born effective-charge diagnostics, the response input, and the dynamical matrix.
First read the actual calculation objects, not the regenerated SVG. Open examples/practical-guides/data/silicon-qe/dielectric/si-epsilon-scf.in, si-epsilon-scf.out, and si-epsilon-scf.err beside the matching si-epsilon-ph.in, si-epsilon-ph.out, si-epsilon-ph.err, and si_epsilon.dyn. Check that the prefix/outdir lineage, structure, q point, executable version, and tensor axes agree. The Silicon workflow explains the bounded native-replay route; a rerun additionally requires the separately obtained hash-matched UPF and an isolated runtime directory.
Read the physical object before replaying the parser
Open the Silicon structure and the response input together and identify how the cell axes map onto the Cartesian tensor. Read all printed dielectric and Born-charge components, not only the diagonal bars in the figure. For a lower-symmetry or polar material, inspect atom-resolved tensors beside the structure and view the phonon displacement or field direction that consumes them. This case has no such mode animation or LO—TO dispersion; the SVG is a compact transcription diagnostic, not a substitute for that inspection. See electronic-property resources and lattice-dynamics viewers for full human routes.
Now inspect the stored text evidence:
grep -F "JOB DONE" examples/cases/silicon-ground-state-electronic-structure/output/si-epsilon-scf.out
grep -E '^[[:space:]]+convergence has been achieved in[[:space:]]+[0-9]+ iterations[[:space:]]*$' examples/cases/silicon-ground-state-electronic-structure/output/si-epsilon-scf.out
grep -F "JOB DONE" examples/cases/silicon-ground-state-electronic-structure/output/si-epsilon-ph.out
grep -A 4 -F "Dielectric constant in cartesian axis" examples/cases/silicon-ground-state-electronic-structure/output/si-epsilon-ph.out
grep -A 16 -F "Effective charges (d Force / dE)" examples/cases/silicon-ground-state-electronic-structure/output/si-epsilon-ph.outThe first and third commands check normal program termination only. The SCF marker checks the electronic solver condition reported by that stored pw.x run. The tensor and effective-charge blocks identify the one-Gamma response that the parser reconstructs. None of them establishes k-mesh, cutoff, response, q-mesh, LO—TO, or observable convergence.
If ph.x has no completion marker, the response block is incomplete, the acoustic-sum residual is unexpected, or tensor axes cannot be mapped to the cell, preserve the input, stdout, stderr, and dynamical matrix and return to the parent SCF/response settings. Do not run the parser to manufacture a complete ledger from a failed or partial response.
Optional reconstruction after inspecting the raw response
python3 examples/practical-guides/silicon_qe_dielectric.py \
--svg public/media/practical-guides/dielectric-response-and-born-effective-charges/check-born-charge-and-dielectric-ledger/silicon-qe-dielectric.svgThe script reads only the committed pw.x/ph.x inputs and outputs. It checks the QE 7.5 markers, the Γ-point response section, the reported 14.026301123 diagonal tensor, the two raw -0.08800 e Silicon diagnostics, the post-processed acoustic-sum-rule values, the SSSP pseudopotential identity, and every public input/output hash.
Quantum ESPRESSO ph.x documents the dielectric and effective-charge response flags. VASP’s Born-effective-charge documentation states the force/field convention and index-order caveat; its electric-field DFPT page describes the linear-response scope.
What this guide verifies
The companion verifies software completion, response-section identity, tensor transcription, Born-charge parsing, the reported acoustic-sum-rule post-processing, deterministic SVG regeneration, and file hashes. The SCF and DFPT iterations reached their printed completion markers, but no dielectric cutoff, k-mesh, q-mesh, or observable convergence series was run.
This single Γ-point result reports an electronic/ion-clamped dielectric tensor; it is not a static dielectric constant including ionic lattice contributions, a phonon dispersion, LO—TO splitting study, converged material response, experimental comparison, or a scientific conclusion.