{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:PFM64PPN2QLTECWNUOR4ZWJ55Y","short_pith_number":"pith:PFM64PPN","canonical_record":{"source":{"id":"2212.06890","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-12-13T20:33:33Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"43c2255d37f1eaa50c606a2f201347157d770b5208a3e3255c7c3514de0f3212","abstract_canon_sha256":"9df2777685ec6247327a3045247b8a3d5e3097b138246af6d7c0400439fdfce7"},"schema_version":"1.0"},"canonical_sha256":"7959ee3dedd417320acda3a3ccd93dee1653ef6ba6302cb7275b7af4cd8cd54d","source":{"kind":"arxiv","id":"2212.06890","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2212.06890","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"arxiv_version","alias_value":"2212.06890v1","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2212.06890","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_12","alias_value":"PFM64PPN2QLT","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_16","alias_value":"PFM64PPN2QLTECWN","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_8","alias_value":"PFM64PPN","created_at":"2026-07-05T05:25:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:PFM64PPN2QLTECWNUOR4ZWJ55Y","target":"record","payload":{"canonical_record":{"source":{"id":"2212.06890","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-12-13T20:33:33Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"43c2255d37f1eaa50c606a2f201347157d770b5208a3e3255c7c3514de0f3212","abstract_canon_sha256":"9df2777685ec6247327a3045247b8a3d5e3097b138246af6d7c0400439fdfce7"},"schema_version":"1.0"},"canonical_sha256":"7959ee3dedd417320acda3a3ccd93dee1653ef6ba6302cb7275b7af4cd8cd54d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:25:18.809721Z","signature_b64":"SLdYsJf1sCU9gt+OPUPdSkDaJaQetD/+4sA10g447weMbLy18RPVHH7KN5C7DQDgyqSf7VwYpzOquUFnSoD6AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7959ee3dedd417320acda3a3ccd93dee1653ef6ba6302cb7275b7af4cd8cd54d","last_reissued_at":"2026-07-05T05:25:18.809287Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:25:18.809287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2212.06890","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":"2026-07-05T05:25:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m8OyMXI9e82IhFtQ1wwrPPhor2zQKRpAI6SyQS5GxWAt/3apT9k9puPsokhV7buqMenX0d9sy29FM717FeEvBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T21:18:48.624174Z"},"content_sha256":"fd31725f2091952c3cff2a9fc28c178d1014b36fa1517a069c0200c0d6e5bc03","schema_version":"1.0","event_id":"sha256:fd31725f2091952c3cff2a9fc28c178d1014b36fa1517a069c0200c0d6e5bc03"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:PFM64PPN2QLTECWNUOR4ZWJ55Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Anomalous Second Harmonic Generation from Atomically Thin MnBi2Te4","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chong Wang, Di Xiao, Dmitry Ovchinnikov, Geoffrey M. Diederich, Jiaqiang Yan, Jiaqi Cai, Jordan Fonseca, Xiaodong Xu","submitted_at":"2022-12-13T20:33:33Z","abstract_excerpt":"MnBi2Te4 is a van der Waals topological insulator with intrinsic intralayer ferromagnetic exchange and A-type antiferromagnetic interlayer coupling. Theoretically, it belongs to a class of structurally centrosymmetric crystals whose layered antiferromagnetic order breaks inversion symmetry for even layer numbers, making optical second harmonic generation (SHG) an ideal probe of the coupling between the crystal and magnetic structures. Here, we perform magnetic field and temperature-dependent SHG measurements on MnBi2Te4 flakes ranging from bulk to monolayer thickness. We find that the dominant"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2212.06890","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/2212.06890/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":"2026-07-05T05:25:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tR4d/x6ap2p+DQQvzixcrl1Zc1ZW89COqjs3MBwDbJ+ohE7SiyQOkyxqb8h6Le27QY39kpFUlcWkEjupLZWDDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-18T21:18:48.624561Z"},"content_sha256":"0c18a82d07f485f015e70fc5317447d8cf1ca877c54b092662eda84168e58feb","schema_version":"1.0","event_id":"sha256:0c18a82d07f485f015e70fc5317447d8cf1ca877c54b092662eda84168e58feb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/bundle.json","state_url":"https://pith.science/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/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":"2026-07-18T21:18:48Z","links":{"resolver":"https://pith.science/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y","bundle":"https://pith.science/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/bundle.json","state":"https://pith.science/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PFM64PPN2QLTECWNUOR4ZWJ55Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:PFM64PPN2QLTECWNUOR4ZWJ55Y","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":"9df2777685ec6247327a3045247b8a3d5e3097b138246af6d7c0400439fdfce7","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-12-13T20:33:33Z","title_canon_sha256":"43c2255d37f1eaa50c606a2f201347157d770b5208a3e3255c7c3514de0f3212"},"schema_version":"1.0","source":{"id":"2212.06890","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2212.06890","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"arxiv_version","alias_value":"2212.06890v1","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2212.06890","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_12","alias_value":"PFM64PPN2QLT","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_16","alias_value":"PFM64PPN2QLTECWN","created_at":"2026-07-05T05:25:18Z"},{"alias_kind":"pith_short_8","alias_value":"PFM64PPN","created_at":"2026-07-05T05:25:18Z"}],"graph_snapshots":[{"event_id":"sha256:0c18a82d07f485f015e70fc5317447d8cf1ca877c54b092662eda84168e58feb","target":"graph","created_at":"2026-07-05T05:25:18Z","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/2212.06890/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"MnBi2Te4 is a van der Waals topological insulator with intrinsic intralayer ferromagnetic exchange and A-type antiferromagnetic interlayer coupling. Theoretically, it belongs to a class of structurally centrosymmetric crystals whose layered antiferromagnetic order breaks inversion symmetry for even layer numbers, making optical second harmonic generation (SHG) an ideal probe of the coupling between the crystal and magnetic structures. Here, we perform magnetic field and temperature-dependent SHG measurements on MnBi2Te4 flakes ranging from bulk to monolayer thickness. We find that the dominant","authors_text":"Chong Wang, Di Xiao, Dmitry Ovchinnikov, Geoffrey M. Diederich, Jiaqiang Yan, Jiaqi Cai, Jordan Fonseca, Xiaodong Xu","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-12-13T20:33:33Z","title":"Anomalous Second Harmonic Generation from Atomically Thin MnBi2Te4"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2212.06890","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:fd31725f2091952c3cff2a9fc28c178d1014b36fa1517a069c0200c0d6e5bc03","target":"record","created_at":"2026-07-05T05:25:18Z","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":"9df2777685ec6247327a3045247b8a3d5e3097b138246af6d7c0400439fdfce7","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-12-13T20:33:33Z","title_canon_sha256":"43c2255d37f1eaa50c606a2f201347157d770b5208a3e3255c7c3514de0f3212"},"schema_version":"1.0","source":{"id":"2212.06890","kind":"arxiv","version":1}},"canonical_sha256":"7959ee3dedd417320acda3a3ccd93dee1653ef6ba6302cb7275b7af4cd8cd54d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7959ee3dedd417320acda3a3ccd93dee1653ef6ba6302cb7275b7af4cd8cd54d","first_computed_at":"2026-07-05T05:25:18.809287Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:25:18.809287Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SLdYsJf1sCU9gt+OPUPdSkDaJaQetD/+4sA10g447weMbLy18RPVHH7KN5C7DQDgyqSf7VwYpzOquUFnSoD6AA==","signature_status":"signed_v1","signed_at":"2026-07-05T05:25:18.809721Z","signed_message":"canonical_sha256_bytes"},"source_id":"2212.06890","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fd31725f2091952c3cff2a9fc28c178d1014b36fa1517a069c0200c0d6e5bc03","sha256:0c18a82d07f485f015e70fc5317447d8cf1ca877c54b092662eda84168e58feb"],"state_sha256":"86e00f21cf8995e3b80a53654f5f7427721f79c039356ef64871fa35a86aac5b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S6fqAywPA3qUP9+ZsxJ2m1wBPHW8TcVGJ5CAgMPab2XiG2Jh1tmDDJeFDKQwQ0bPTVgygpnIdRHfqJAcnjHqAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-18T21:18:48.626733Z","bundle_sha256":"b7098f54779a4700665fe342d76158d358033b69737225bb1c786e8e788c2cb7"}}