{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:L6HNDYYW2ZDI4BFBPRZGDYFPKW","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"1f595a89deff9e5ae197fa28e9bceef089285909ecf109d0c6fc8014571e327a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2020-07-16T09:38:29Z","title_canon_sha256":"b01e79d02c71bb8fdebaf4358cef62e2222eea0146c9fa0b702bd636a12d7719"},"schema_version":"1.0","source":{"id":"2007.08212","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2007.08212","created_at":"2026-07-05T03:03:38Z"},{"alias_kind":"arxiv_version","alias_value":"2007.08212v4","created_at":"2026-07-05T03:03:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2007.08212","created_at":"2026-07-05T03:03:38Z"},{"alias_kind":"pith_short_12","alias_value":"L6HNDYYW2ZDI","created_at":"2026-07-05T03:03:38Z"},{"alias_kind":"pith_short_16","alias_value":"L6HNDYYW2ZDI4BFB","created_at":"2026-07-05T03:03:38Z"},{"alias_kind":"pith_short_8","alias_value":"L6HNDYYW","created_at":"2026-07-05T03:03:38Z"}],"graph_snapshots":[{"event_id":"sha256:a72615acfa02b0391db768a79e997fb293587a4c911659aff195925205f4fff6","target":"graph","created_at":"2026-07-05T03:03:38Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2007.08212/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Coulomb attraction between electrons and holes in a narrow-gap semiconductor or a semimetal is predicted to lead to an elusive phase of matter dubbed 'excitonic insulator'. However, direct observation of such electronic instability remains extremely rare. Here, we report the observation of incipient divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 using Raman spectroscopy. Critical fluctuations of the excitonic order parameter give rise to quasi-elastic scattering of B2g symmetry, whose intensity grows inversely with temperature toward the Weiss temperature ","authors_text":"B. J. Kim, Changil Kwon, Hoon Kim, Jonghwan Kim, Jun Sung Kim, Kwangrae Kim","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2020-07-16T09:38:29Z","title":"Direct observation of excitonic instability in Ta2NiSe5"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2007.08212","kind":"arxiv","version":4},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:6cd64519c18c5bb86ffff97505190528bb6d103b93f37866d35f01bb2888aab1","target":"record","created_at":"2026-07-05T03:03:38Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"1f595a89deff9e5ae197fa28e9bceef089285909ecf109d0c6fc8014571e327a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2020-07-16T09:38:29Z","title_canon_sha256":"b01e79d02c71bb8fdebaf4358cef62e2222eea0146c9fa0b702bd636a12d7719"},"schema_version":"1.0","source":{"id":"2007.08212","kind":"arxiv","version":4}},"canonical_sha256":"5f8ed1e316d6468e04a17c7261e0af5597241c8d136db64b2cc3ae76288a0211","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5f8ed1e316d6468e04a17c7261e0af5597241c8d136db64b2cc3ae76288a0211","first_computed_at":"2026-07-05T03:03:38.050120Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:03:38.050120Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KhO6SKPiRP/m1mo96xhlT9Qe6o/vxq5O86dmi0dCY5VZPtlVjzeDFMBtU1vtUFgpiCJWVdZDJv5XBmu9eLG7Dw==","signature_status":"signed_v1","signed_at":"2026-07-05T03:03:38.050524Z","signed_message":"canonical_sha256_bytes"},"source_id":"2007.08212","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6cd64519c18c5bb86ffff97505190528bb6d103b93f37866d35f01bb2888aab1","sha256:a72615acfa02b0391db768a79e997fb293587a4c911659aff195925205f4fff6"],"state_sha256":"ab3066c1f51e90e8baf9c1075c7457cb2754bb247d5f449b02cd02adae38d1ce"}