{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:J7PX6PL2MLT5ECBOWYKOQO64GU","short_pith_number":"pith:J7PX6PL2","canonical_record":{"source":{"id":"1907.03722","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-08T16:59:22Z","cross_cats_sorted":[],"title_canon_sha256":"e819eb51dc41d270a2cc0e22e8fcdf2cc4959f00c994ed755799a3df78dbac1e","abstract_canon_sha256":"b05321a2bc2866634032e0ab94154628e26bd7bb40cfa037d94ecda042bff49b"},"schema_version":"1.0"},"canonical_sha256":"4fdf7f3d7a62e7d2082eb614e83bdc350e9925279bdf032f2b1897b2776728e8","source":{"kind":"arxiv","id":"1907.03722","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.03722","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"arxiv_version","alias_value":"1907.03722v2","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.03722","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_12","alias_value":"J7PX6PL2MLT5","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_16","alias_value":"J7PX6PL2MLT5ECBO","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_8","alias_value":"J7PX6PL2","created_at":"2026-07-05T00:22:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:J7PX6PL2MLT5ECBOWYKOQO64GU","target":"record","payload":{"canonical_record":{"source":{"id":"1907.03722","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-08T16:59:22Z","cross_cats_sorted":[],"title_canon_sha256":"e819eb51dc41d270a2cc0e22e8fcdf2cc4959f00c994ed755799a3df78dbac1e","abstract_canon_sha256":"b05321a2bc2866634032e0ab94154628e26bd7bb40cfa037d94ecda042bff49b"},"schema_version":"1.0"},"canonical_sha256":"4fdf7f3d7a62e7d2082eb614e83bdc350e9925279bdf032f2b1897b2776728e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:22:00.526605Z","signature_b64":"tYCSDos1HQ2Zd2sGFYz8bafIkyGMiVPhlvRKL1mhDujrkLxsT46epZcLHfuGiWgNQUNwwPMImv+8o11QuQ2pBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4fdf7f3d7a62e7d2082eb614e83bdc350e9925279bdf032f2b1897b2776728e8","last_reissued_at":"2026-07-05T00:22:00.526045Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:22:00.526045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.03722","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:22:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gW/scXETTyopMxYsen+4C8HhvacP3bd5KemSfwg/tdlXJgAAoZeShkNmppiYmz5d++r1+qiswtkPK/SriV0MDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T00:30:12.272242Z"},"content_sha256":"e80425f68b70248705da12399e35cda554f38f77a4bde496d413a00f582d64d0","schema_version":"1.0","event_id":"sha256:e80425f68b70248705da12399e35cda554f38f77a4bde496d413a00f582d64d0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:J7PX6PL2MLT5ECBOWYKOQO64GU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi$_2$Te$_4$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chang Liu, Chaowei Hu, Chaoyu Chen, Eike F. Schwier, Hongyi Sun, Jiawei Mei, Kenya Shimada, Ke Zhang, Liusuo Wu, Masashi Arita, Meng Zeng, Ni Ni, Pengfei Liu, Qihang Liu, Rui'e Lu, Shiv Kumar, Xiao-Ming Ma, Yuan Wang, Yue Feng, Yu-Jie Hao, Zhanyang Hao","submitted_at":"2019-07-08T16:59:22Z","abstract_excerpt":"The recent discovered antiferromagnetic topological insulators in Mn-Bi-Te family with intrinsic magnetic ordering have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states with half-integer quantum Hall effect. Here, however, we show unambiguously by using high-resolution angle-resolved photoemission spectroscopy that a gapless Dirac cone at the (0001) surface of MnBi$_2$Te$_4$ exists between the bulk band gap. Such unexpected surface state remains unchanged across the bulk N\\'eel temperature, and is even robust against "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.03722","kind":"arxiv","version":2},"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/1907.03722/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":"2026-07-05T00:22:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xJUjXBbksa+0uDej/HYORue0r5a/U80or0HNzh/WvhnZ8sZrOwMBlmBR7fam7rKdA4nZgW8XfdA85xe3W3luCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T00:30:12.272828Z"},"content_sha256":"ca5f52093341c9ae05a7733f5ec95e759b795c6ffcda24504a0c21f04999be9a","schema_version":"1.0","event_id":"sha256:ca5f52093341c9ae05a7733f5ec95e759b795c6ffcda24504a0c21f04999be9a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/bundle.json","state_url":"https://pith.science/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/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":"2026-08-16T00:30:12Z","links":{"resolver":"https://pith.science/pith/J7PX6PL2MLT5ECBOWYKOQO64GU","bundle":"https://pith.science/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/bundle.json","state":"https://pith.science/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J7PX6PL2MLT5ECBOWYKOQO64GU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:J7PX6PL2MLT5ECBOWYKOQO64GU","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":"b05321a2bc2866634032e0ab94154628e26bd7bb40cfa037d94ecda042bff49b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-08T16:59:22Z","title_canon_sha256":"e819eb51dc41d270a2cc0e22e8fcdf2cc4959f00c994ed755799a3df78dbac1e"},"schema_version":"1.0","source":{"id":"1907.03722","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.03722","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"arxiv_version","alias_value":"1907.03722v2","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.03722","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_12","alias_value":"J7PX6PL2MLT5","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_16","alias_value":"J7PX6PL2MLT5ECBO","created_at":"2026-07-05T00:22:00Z"},{"alias_kind":"pith_short_8","alias_value":"J7PX6PL2","created_at":"2026-07-05T00:22:00Z"}],"graph_snapshots":[{"event_id":"sha256:ca5f52093341c9ae05a7733f5ec95e759b795c6ffcda24504a0c21f04999be9a","target":"graph","created_at":"2026-07-05T00:22:00Z","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/1907.03722/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The recent discovered antiferromagnetic topological insulators in Mn-Bi-Te family with intrinsic magnetic ordering have rapidly drawn broad interest since its cleaved surface state is believed to be gapped, hosting the unprecedented axion states with half-integer quantum Hall effect. Here, however, we show unambiguously by using high-resolution angle-resolved photoemission spectroscopy that a gapless Dirac cone at the (0001) surface of MnBi$_2$Te$_4$ exists between the bulk band gap. Such unexpected surface state remains unchanged across the bulk N\\'eel temperature, and is even robust against ","authors_text":"Chang Liu, Chaowei Hu, Chaoyu Chen, Eike F. Schwier, Hongyi Sun, Jiawei Mei, Kenya Shimada, Ke Zhang, Liusuo Wu, Masashi Arita, Meng Zeng, Ni Ni, Pengfei Liu, Qihang Liu, Rui'e Lu, Shiv Kumar, Xiao-Ming Ma, Yuan Wang, Yue Feng, Yu-Jie Hao, Zhanyang Hao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-08T16:59:22Z","title":"Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi$_2$Te$_4$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.03722","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:e80425f68b70248705da12399e35cda554f38f77a4bde496d413a00f582d64d0","target":"record","created_at":"2026-07-05T00:22:00Z","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":"b05321a2bc2866634032e0ab94154628e26bd7bb40cfa037d94ecda042bff49b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-07-08T16:59:22Z","title_canon_sha256":"e819eb51dc41d270a2cc0e22e8fcdf2cc4959f00c994ed755799a3df78dbac1e"},"schema_version":"1.0","source":{"id":"1907.03722","kind":"arxiv","version":2}},"canonical_sha256":"4fdf7f3d7a62e7d2082eb614e83bdc350e9925279bdf032f2b1897b2776728e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4fdf7f3d7a62e7d2082eb614e83bdc350e9925279bdf032f2b1897b2776728e8","first_computed_at":"2026-07-05T00:22:00.526045Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:22:00.526045Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tYCSDos1HQ2Zd2sGFYz8bafIkyGMiVPhlvRKL1mhDujrkLxsT46epZcLHfuGiWgNQUNwwPMImv+8o11QuQ2pBw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:22:00.526605Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.03722","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e80425f68b70248705da12399e35cda554f38f77a4bde496d413a00f582d64d0","sha256:ca5f52093341c9ae05a7733f5ec95e759b795c6ffcda24504a0c21f04999be9a"],"state_sha256":"a0eb6402a8e66a57c673ad4274624d4ffd1a2b5e05c761510909a7c2e44d8b18"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qShPZ8xq4YqNc+gdIlNphI4RcAd+cCSTbNHTByuLiqKW6Xud299D2+GRpguD877b6njUj+U82RSZY/8ICmiqBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T00:30:12.277975Z","bundle_sha256":"63490b62ced01d219badc7c20ea87af628f70aad80f330acfde9fa240972776f"}}