{
  "source_root": "/home/talos/work/Atlas-evidence/2026-10-03/content-enrichment/sections/strain/verification/al",
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  "definition": "J_nm(q)=mean_k delta_sigma(E_n(k)-EF) delta_sigma(E_m(k+q)-EF)",
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  "scope": "Geometric band-pair weights, not orbital/layer-resolved EPC or static susceptibility",
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