{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:HVV4OB2CZN4WLPKQRK7V3OCYDR","short_pith_number":"pith:HVV4OB2C","canonical_record":{"source":{"id":"2605.21767","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-20T21:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"260d0b504a988c063cf8d2cc8728ea370040283570cb496139101fdf8c238b58","abstract_canon_sha256":"9e63f725878694e27ca31fa3ff6f27b1e2988749e4b58ad535f980e6b9b8e5f0"},"schema_version":"1.0"},"canonical_sha256":"3d6bc70742cb7965bd508abf5db8581c520a2f53d65929fe0ffb697c93251870","source":{"kind":"arxiv","id":"2605.21767","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.21767","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"arxiv_version","alias_value":"2605.21767v1","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.21767","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_12","alias_value":"HVV4OB2CZN4W","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_16","alias_value":"HVV4OB2CZN4WLPKQ","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_8","alias_value":"HVV4OB2C","created_at":"2026-05-22T01:03:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:HVV4OB2CZN4WLPKQRK7V3OCYDR","target":"record","payload":{"canonical_record":{"source":{"id":"2605.21767","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-20T21:59:59Z","cross_cats_sorted":[],"title_canon_sha256":"260d0b504a988c063cf8d2cc8728ea370040283570cb496139101fdf8c238b58","abstract_canon_sha256":"9e63f725878694e27ca31fa3ff6f27b1e2988749e4b58ad535f980e6b9b8e5f0"},"schema_version":"1.0"},"canonical_sha256":"3d6bc70742cb7965bd508abf5db8581c520a2f53d65929fe0ffb697c93251870","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-22T01:03:31.050596Z","signature_b64":"zKY/JNk45O4wrco4oUp+yoLuGQIiCG5KU1o4xEJcRnH+6M0Z0+wejUviW9DsVJWM5clJfWkCa4+s5FcVuIinAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3d6bc70742cb7965bd508abf5db8581c520a2f53d65929fe0ffb697c93251870","last_reissued_at":"2026-05-22T01:03:31.050146Z","signature_status":"signed_v1","first_computed_at":"2026-05-22T01:03:31.050146Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.21767","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-22T01:03:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Un2/ws3a7wmJaoGwF50m0BmQSS3tX4qxx3IrRrG4ZEQ+yaEkQQwBtDiG1kT/PsLu50xvBxFFf5IGrxYzAPY7BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T05:08:47.436201Z"},"content_sha256":"89745a8df484b543ba9b6cd34afb873b5a527c735c4c8e7fa7bef2038231a6b9","schema_version":"1.0","event_id":"sha256:89745a8df484b543ba9b6cd34afb873b5a527c735c4c8e7fa7bef2038231a6b9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:HVV4OB2CZN4WLPKQRK7V3OCYDR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Uncovering Antipolar Ordering and Pressure-Tunable Phases in Hexagonal LaN","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Atanu Paul, Charles Paillard, Laurent Bellaiche","submitted_at":"2026-05-20T21:59:59Z","abstract_excerpt":"We predict an antipolar instability in hexagonal LaN using first-principles density functional theory. Starting from a nonpolar hexagonal phase, we identify competing polar and antipolar zone-center phonon instabilities. Condensation of the polar and antipolar modes stabilizes, respectively, dynamically stable wurtzite (WZ) phase and an hexagonal antipolar (AP) phase which is characterized by alternating local polarization and zero net macroscopic polarization within the unit cell. At ambient conditions, the AP phase is metastable with respect to the WZ phase, and a finite energy barrier exist"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.21767","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.21767/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-22T01:03:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VB2KkNLoN9dTAoF+COecQg/gQ0oiJPUOMvrgLncbAIOiDFb6L7Dv0sf1xtYSrvvQn62oGJa6gpJsAFbt18ptDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T05:08:47.436771Z"},"content_sha256":"6327f7df9adc8edb4997d4228139ff98a903261eb38a43291e6e2a708bbbf13c","schema_version":"1.0","event_id":"sha256:6327f7df9adc8edb4997d4228139ff98a903261eb38a43291e6e2a708bbbf13c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/bundle.json","state_url":"https://pith.science/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-23T05:08:47Z","links":{"resolver":"https://pith.science/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR","bundle":"https://pith.science/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/bundle.json","state":"https://pith.science/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HVV4OB2CZN4WLPKQRK7V3OCYDR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:HVV4OB2CZN4WLPKQRK7V3OCYDR","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":"9e63f725878694e27ca31fa3ff6f27b1e2988749e4b58ad535f980e6b9b8e5f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-20T21:59:59Z","title_canon_sha256":"260d0b504a988c063cf8d2cc8728ea370040283570cb496139101fdf8c238b58"},"schema_version":"1.0","source":{"id":"2605.21767","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.21767","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"arxiv_version","alias_value":"2605.21767v1","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.21767","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_12","alias_value":"HVV4OB2CZN4W","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_16","alias_value":"HVV4OB2CZN4WLPKQ","created_at":"2026-05-22T01:03:31Z"},{"alias_kind":"pith_short_8","alias_value":"HVV4OB2C","created_at":"2026-05-22T01:03:31Z"}],"graph_snapshots":[{"event_id":"sha256:6327f7df9adc8edb4997d4228139ff98a903261eb38a43291e6e2a708bbbf13c","target":"graph","created_at":"2026-05-22T01:03:31Z","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/2605.21767/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We predict an antipolar instability in hexagonal LaN using first-principles density functional theory. Starting from a nonpolar hexagonal phase, we identify competing polar and antipolar zone-center phonon instabilities. Condensation of the polar and antipolar modes stabilizes, respectively, dynamically stable wurtzite (WZ) phase and an hexagonal antipolar (AP) phase which is characterized by alternating local polarization and zero net macroscopic polarization within the unit cell. At ambient conditions, the AP phase is metastable with respect to the WZ phase, and a finite energy barrier exist","authors_text":"Atanu Paul, Charles Paillard, Laurent Bellaiche","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-20T21:59:59Z","title":"Uncovering Antipolar Ordering and Pressure-Tunable Phases in Hexagonal LaN"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.21767","kind":"arxiv","version":1},"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":"sha256:89745a8df484b543ba9b6cd34afb873b5a527c735c4c8e7fa7bef2038231a6b9","target":"record","created_at":"2026-05-22T01:03:31Z","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":"9e63f725878694e27ca31fa3ff6f27b1e2988749e4b58ad535f980e6b9b8e5f0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-05-20T21:59:59Z","title_canon_sha256":"260d0b504a988c063cf8d2cc8728ea370040283570cb496139101fdf8c238b58"},"schema_version":"1.0","source":{"id":"2605.21767","kind":"arxiv","version":1}},"canonical_sha256":"3d6bc70742cb7965bd508abf5db8581c520a2f53d65929fe0ffb697c93251870","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3d6bc70742cb7965bd508abf5db8581c520a2f53d65929fe0ffb697c93251870","first_computed_at":"2026-05-22T01:03:31.050146Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-22T01:03:31.050146Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zKY/JNk45O4wrco4oUp+yoLuGQIiCG5KU1o4xEJcRnH+6M0Z0+wejUviW9DsVJWM5clJfWkCa4+s5FcVuIinAw==","signature_status":"signed_v1","signed_at":"2026-05-22T01:03:31.050596Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.21767","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:89745a8df484b543ba9b6cd34afb873b5a527c735c4c8e7fa7bef2038231a6b9","sha256:6327f7df9adc8edb4997d4228139ff98a903261eb38a43291e6e2a708bbbf13c"],"state_sha256":"c47ff135edf3665512bb1e0b047344a971f069ef909057237d76b7c84a937e08"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N/XNusZHksdFzGFW9O5HWzgwilKsT5Eiwcsxy0r9rcrGX8HKtFXgCLCN+hIcfLIeRvXic5LdZXD/DqrTq3gVCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T05:08:47.439619Z","bundle_sha256":"b92a73aee60877449c5c1e722aef2ec302972add0696c3b61683179e144b76eb"}}