{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:P2EW654WBD56CEJDYVJ7DRQLRD","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":"5296dffa2db1a305325a37bac8b639f9cf769f046a18027469c171e4d26cffe6","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-11-16T18:03:21Z","title_canon_sha256":"7b212600d28ff476527b432bc57fb5ad6a43b9d2b0d7a15ada81398371fcf536"},"schema_version":"1.0","source":{"id":"2411.10852","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2411.10852","created_at":"2026-07-05T11:38:25Z"},{"alias_kind":"arxiv_version","alias_value":"2411.10852v2","created_at":"2026-07-05T11:38:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2411.10852","created_at":"2026-07-05T11:38:25Z"},{"alias_kind":"pith_short_12","alias_value":"P2EW654WBD56","created_at":"2026-07-05T11:38:25Z"},{"alias_kind":"pith_short_16","alias_value":"P2EW654WBD56CEJD","created_at":"2026-07-05T11:38:25Z"},{"alias_kind":"pith_short_8","alias_value":"P2EW654W","created_at":"2026-07-05T11:38:25Z"}],"graph_snapshots":[{"event_id":"sha256:648306e0bcb4bf68561639f7bae739b6455fe7a8fd0e8184abd7273b34551ede","target":"graph","created_at":"2026-07-05T11:38:25Z","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/2411.10852/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have investigated the terahertz (THz) nonlinear response of the multigap superconductor MgB$_2$, using THz two-dimensional coherent spectroscopy (THz 2DCS). With broadband THz drive fields, we identified a nonlinear response at twice the lower superconducting gap energy $2\\Delta_{\\pi}$ at the lowest temperatures. Using narrow-band THz driving pulses, we observed first (FH) and third harmonic responses. The FH intensity shows a monotonic increase with decreasing temperature when properly normalized by the driving field strength. This is distinct from the single-gap superconductor NbN, where ","authors_text":"Jiahao Liang, Ke Chen, Kota Katsumi, N. P. Armitage, Ralph Romero III, Xiaoxing Xi","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-11-16T18:03:21Z","title":"Amplitude mode in a multi-gap superconductor MgB$_2$ investigated by terahertz two-dimensional coherent spectroscopy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.10852","kind":"arxiv","version":2},"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":"sha256:542843c31bfa14db92de276439393f7be16f3afb052eea027fc7978d0adeb28e","target":"record","created_at":"2026-07-05T11:38:25Z","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":"5296dffa2db1a305325a37bac8b639f9cf769f046a18027469c171e4d26cffe6","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2024-11-16T18:03:21Z","title_canon_sha256":"7b212600d28ff476527b432bc57fb5ad6a43b9d2b0d7a15ada81398371fcf536"},"schema_version":"1.0","source":{"id":"2411.10852","kind":"arxiv","version":2}},"canonical_sha256":"7e896f779608fbe11123c553f1c60b88e3ac63b685e6da5032c2de9064c11c1e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7e896f779608fbe11123c553f1c60b88e3ac63b685e6da5032c2de9064c11c1e","first_computed_at":"2026-07-05T11:38:25.478430Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:38:25.478430Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"7Bk5t0t/sns1VCL8WmcWL32HQK30mvJOlNwReHJX3BumKIz5OvY/Pf9UyzqRhfnnKY7FaHBje5cwIFvV97P+BQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:38:25.478964Z","signed_message":"canonical_sha256_bytes"},"source_id":"2411.10852","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:542843c31bfa14db92de276439393f7be16f3afb052eea027fc7978d0adeb28e","sha256:648306e0bcb4bf68561639f7bae739b6455fe7a8fd0e8184abd7273b34551ede"],"state_sha256":"77386bf8d1f7dd378ea76eebd9b7c942da8141b0306fc86df61256e225b61105"}