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Indeed, the phase fluctuations of the CDW order parameter act as a dynamical axion field $\\theta({\\vec{x}},t)$ and couples to electromagnetic field via $\\mathcal{L}_{\\theta}=\\frac{\\theta(\\vec{x},t)}{32\\pi^2} \\epsilon^{\\sigma\\tau\\nu\\mu} F_{\\sigma\\tau} F_{\\nu\\mu}.$ Additionally, when the axion"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1605.02734","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2016-05-09T20:00:02Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"0d9e83790cd39867205521e9d438782d0d24020c0c4ce2e26f46b8a8c71d74eb","abstract_canon_sha256":"a5a2f91fda03b457c7a8aba67d6004512a87baf8f16e6c62e307c79f8db57d80"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:09:34.505665Z","signature_b64":"cBvR5wsezzYT70jsgnHF2O/pmj19SyIcr5PkejBawDwRCNl8WAup61qAofvd/2dbPdO0HZhFDJxLGbpzFFT4Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9919f7fe9db4a13009c887d90cc6255604eaa14b6da024ddad6354c0d72d96e","last_reissued_at":"2026-05-18T01:09:34.505232Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:09:34.505232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Response Properties of Axion Insulators and Weyl Semimetals Driven by Screw Dislocations and Dynamical Axion Strings","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"cond-mat.str-el","authors_text":"Gil Young Cho, Taylor L. 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