{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:UXRABFHYHM77JTKWV24FWVLWYK","short_pith_number":"pith:UXRABFHY","canonical_record":{"source":{"id":"2205.01994","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-05-04T11:02:07Z","cross_cats_sorted":[],"title_canon_sha256":"c6eec8d40f74b03c6612ff8470ed62fe6f678d0e61427414c2d9ce2eaa62214c","abstract_canon_sha256":"9f8ba1c188dbb0c298b8e9d89f772aeab3c1e3845cbce86744f89047024ccc05"},"schema_version":"1.0"},"canonical_sha256":"a5e20094f83b3ff4cd56aeb85b5576c2828dd20d1ed92f825d6a8448e90d3658","source":{"kind":"arxiv","id":"2205.01994","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2205.01994","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"arxiv_version","alias_value":"2205.01994v1","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2205.01994","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_12","alias_value":"UXRABFHYHM77","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_16","alias_value":"UXRABFHYHM77JTKW","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_8","alias_value":"UXRABFHY","created_at":"2026-07-05T04:20:24Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:UXRABFHYHM77JTKWV24FWVLWYK","target":"record","payload":{"canonical_record":{"source":{"id":"2205.01994","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-05-04T11:02:07Z","cross_cats_sorted":[],"title_canon_sha256":"c6eec8d40f74b03c6612ff8470ed62fe6f678d0e61427414c2d9ce2eaa62214c","abstract_canon_sha256":"9f8ba1c188dbb0c298b8e9d89f772aeab3c1e3845cbce86744f89047024ccc05"},"schema_version":"1.0"},"canonical_sha256":"a5e20094f83b3ff4cd56aeb85b5576c2828dd20d1ed92f825d6a8448e90d3658","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:20:24.361257Z","signature_b64":"/fgDH9li5WK2TW2s5XIq4JAtn5MfLSkrZ9t4BThHZwkOaQhssYQPp50UH0WB1zXZzmixUJMxD2gx0V8NeervBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5e20094f83b3ff4cd56aeb85b5576c2828dd20d1ed92f825d6a8448e90d3658","last_reissued_at":"2026-07-05T04:20:24.360903Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:20:24.360903Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2205.01994","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":"2026-07-05T04:20:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v7Q6cm4TEtGPhC/AYuf6XLNIeJRDFLHHwPdC/mP8qqdvSX9gZdZuvrSxbIDfuKQfZUiJ58k0ki30xJsG4EPYCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:55:55.954411Z"},"content_sha256":"0a9aca792e55857783c815e347778b743b9176f3d37315711cfb035c34d5b653","schema_version":"1.0","event_id":"sha256:0a9aca792e55857783c815e347778b743b9176f3d37315711cfb035c34d5b653"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:UXRABFHYHM77JTKWV24FWVLWYK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-dimensional Obstructed Atomic Insulators with Fractional Corner Charge in MA$_2$Z$_4$ Family","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Hongming Weng, Jiangxu Li, Jiaxi Liu, Lei Wang, Peitao Liu, Shuai Zhang, Xing-Qiu Chen, Yan Sun, Yi Jiang","submitted_at":"2022-05-04T11:02:07Z","abstract_excerpt":"According to topological quantum chemistry, a class of electronic materials have been called obstructed atomic insulators (OAIs), in which a portion of valence electrons necessarily have their centers located on some empty $\\textit{Wyckoff}$ positions without atoms occupation in the lattice. The obstruction of centering these electrons coinciding with their host atoms is nontrivial and results in metallic boundary states when the boundary is properly cut. Here, on basis of first-principles calculations in combination with topological quantum chemistry analysis, we propose two dimensional MA$_2"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2205.01994","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/2205.01994/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":"2026-07-05T04:20:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eu3vd9M7PLuxabiikdKBXlCepkWzL4BAMxm0tCuMHbKwCnK11OGWpHv3mKuckE2ibq7e61c/bDMJ29TsC2/wBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T17:55:55.954906Z"},"content_sha256":"34b93f2795f02efbd6e364497266879d4636a005d725b8b03a04eb050615e519","schema_version":"1.0","event_id":"sha256:34b93f2795f02efbd6e364497266879d4636a005d725b8b03a04eb050615e519"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UXRABFHYHM77JTKWV24FWVLWYK/bundle.json","state_url":"https://pith.science/pith/UXRABFHYHM77JTKWV24FWVLWYK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UXRABFHYHM77JTKWV24FWVLWYK/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":"2026-08-03T17:55:55Z","links":{"resolver":"https://pith.science/pith/UXRABFHYHM77JTKWV24FWVLWYK","bundle":"https://pith.science/pith/UXRABFHYHM77JTKWV24FWVLWYK/bundle.json","state":"https://pith.science/pith/UXRABFHYHM77JTKWV24FWVLWYK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UXRABFHYHM77JTKWV24FWVLWYK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:UXRABFHYHM77JTKWV24FWVLWYK","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":"9f8ba1c188dbb0c298b8e9d89f772aeab3c1e3845cbce86744f89047024ccc05","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-05-04T11:02:07Z","title_canon_sha256":"c6eec8d40f74b03c6612ff8470ed62fe6f678d0e61427414c2d9ce2eaa62214c"},"schema_version":"1.0","source":{"id":"2205.01994","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2205.01994","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"arxiv_version","alias_value":"2205.01994v1","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2205.01994","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_12","alias_value":"UXRABFHYHM77","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_16","alias_value":"UXRABFHYHM77JTKW","created_at":"2026-07-05T04:20:24Z"},{"alias_kind":"pith_short_8","alias_value":"UXRABFHY","created_at":"2026-07-05T04:20:24Z"}],"graph_snapshots":[{"event_id":"sha256:34b93f2795f02efbd6e364497266879d4636a005d725b8b03a04eb050615e519","target":"graph","created_at":"2026-07-05T04:20:24Z","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/2205.01994/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"According to topological quantum chemistry, a class of electronic materials have been called obstructed atomic insulators (OAIs), in which a portion of valence electrons necessarily have their centers located on some empty $\\textit{Wyckoff}$ positions without atoms occupation in the lattice. The obstruction of centering these electrons coinciding with their host atoms is nontrivial and results in metallic boundary states when the boundary is properly cut. Here, on basis of first-principles calculations in combination with topological quantum chemistry analysis, we propose two dimensional MA$_2","authors_text":"Hongming Weng, Jiangxu Li, Jiaxi Liu, Lei Wang, Peitao Liu, Shuai Zhang, Xing-Qiu Chen, Yan Sun, Yi Jiang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-05-04T11:02:07Z","title":"Two-dimensional Obstructed Atomic Insulators with Fractional Corner Charge in MA$_2$Z$_4$ Family"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2205.01994","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":"sha256:0a9aca792e55857783c815e347778b743b9176f3d37315711cfb035c34d5b653","target":"record","created_at":"2026-07-05T04:20:24Z","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":"9f8ba1c188dbb0c298b8e9d89f772aeab3c1e3845cbce86744f89047024ccc05","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-05-04T11:02:07Z","title_canon_sha256":"c6eec8d40f74b03c6612ff8470ed62fe6f678d0e61427414c2d9ce2eaa62214c"},"schema_version":"1.0","source":{"id":"2205.01994","kind":"arxiv","version":1}},"canonical_sha256":"a5e20094f83b3ff4cd56aeb85b5576c2828dd20d1ed92f825d6a8448e90d3658","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5e20094f83b3ff4cd56aeb85b5576c2828dd20d1ed92f825d6a8448e90d3658","first_computed_at":"2026-07-05T04:20:24.360903Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:20:24.360903Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/fgDH9li5WK2TW2s5XIq4JAtn5MfLSkrZ9t4BThHZwkOaQhssYQPp50UH0WB1zXZzmixUJMxD2gx0V8NeervBg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:20:24.361257Z","signed_message":"canonical_sha256_bytes"},"source_id":"2205.01994","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0a9aca792e55857783c815e347778b743b9176f3d37315711cfb035c34d5b653","sha256:34b93f2795f02efbd6e364497266879d4636a005d725b8b03a04eb050615e519"],"state_sha256":"f86e10ac83d155e844acabfe3185ce153b7775c3561ea8bac116acb2cc8fbd69"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zxTc5CDdjkemOFD3ZVg0QcefxyrLEro+4CUpKa94WGkq/yjWTw0dUmSHA6vQN4GgM1GsG764n907U/SrwD7EDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T17:55:55.958543Z","bundle_sha256":"125f8fe7ad703ca9c39513cabefb183a83110a2554831846356dbe90787efed8"}}