{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:MMGGSHYLRWCMIUCZ5P7MATUEGX","short_pith_number":"pith:MMGGSHYL","canonical_record":{"source":{"id":"2404.13533","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2024-04-21T05:08:56Z","cross_cats_sorted":[],"title_canon_sha256":"c0a203fb7878357f4527a84f90e8c37f3f44e48f362cd740d1d2ef65229165c0","abstract_canon_sha256":"d2bb124c720b0b8e8abe1e9080509484f82db003cc384bb4677e39f74903d053"},"schema_version":"1.0"},"canonical_sha256":"630c691f0b8d84c45059ebfec04e8435c72f85fb997523fd0a6a4a81f6263d48","source":{"kind":"arxiv","id":"2404.13533","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.13533","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"arxiv_version","alias_value":"2404.13533v1","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.13533","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_12","alias_value":"MMGGSHYLRWCM","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_16","alias_value":"MMGGSHYLRWCMIUCZ","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_8","alias_value":"MMGGSHYL","created_at":"2026-07-05T08:10:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:MMGGSHYLRWCMIUCZ5P7MATUEGX","target":"record","payload":{"canonical_record":{"source":{"id":"2404.13533","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2024-04-21T05:08:56Z","cross_cats_sorted":[],"title_canon_sha256":"c0a203fb7878357f4527a84f90e8c37f3f44e48f362cd740d1d2ef65229165c0","abstract_canon_sha256":"d2bb124c720b0b8e8abe1e9080509484f82db003cc384bb4677e39f74903d053"},"schema_version":"1.0"},"canonical_sha256":"630c691f0b8d84c45059ebfec04e8435c72f85fb997523fd0a6a4a81f6263d48","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:10:33.798227Z","signature_b64":"QAxU3hlrlkveiv3ExV23T7oLtdgjTPH+8SDpO8gpsdZAH8zlmie3NaCH1sdDJSznGt5d/vT3e+MOXgwQQD0sBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"630c691f0b8d84c45059ebfec04e8435c72f85fb997523fd0a6a4a81f6263d48","last_reissued_at":"2026-07-05T08:10:33.797831Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:10:33.797831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2404.13533","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":"2026-07-05T08:10:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C4BYTox/Gl+oqm0toVOQpKIAxsYMnOMxMcFazL5brvgDEKjVVRZztLMz88dWwzEwSGLdnNXxtNPXqd1p0FG4AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T17:12:43.566017Z"},"content_sha256":"a54d1a6e39c0ea1c5eaf59a1ce7e2c6ab63697b0fb4c82ecf2502f37c9c72973","schema_version":"1.0","event_id":"sha256:a54d1a6e39c0ea1c5eaf59a1ce7e2c6ab63697b0fb4c82ecf2502f37c9c72973"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:MMGGSHYLRWCMIUCZ5P7MATUEGX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pinch-point spectral singularity from the interference of topological loop states","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chisa Hotta, Hiroki Nakai, Masafumi Udagawa","submitted_at":"2024-04-21T05:08:56Z","abstract_excerpt":"Pinch point is a spectral discontinuity found in the neutron diffraction image of spin ice. Similar spectral singularity is commonly observed in a broad range of systems that have a close connection with flat bands. We focus on the electron flat band and its two topologically distinct classes of wavefunction: the compact localized state (CLS), and the non-contractible loop state (NLS). We establish their simple mathematical relationship, showing that different Bloch NLSs can be derived as momentum derivatives of a Bloch CLS, depending on the approaching direction toward the singular point. Thi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.13533","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/2404.13533/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":"2026-07-05T08:10:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vb15eSvn23FzDRMcEfexnV36uknP7ZcnEyiBw2DLsQVeGoAEGvedRJ77d7X2yxJ6DGW7oweayA2/kvBog9emDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T17:12:43.566363Z"},"content_sha256":"c7c02c3e4c936521d787ad630d97da82d4ac61b106652074cf7378f82f71fdb3","schema_version":"1.0","event_id":"sha256:c7c02c3e4c936521d787ad630d97da82d4ac61b106652074cf7378f82f71fdb3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/bundle.json","state_url":"https://pith.science/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/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":"2026-08-05T17:12:43Z","links":{"resolver":"https://pith.science/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX","bundle":"https://pith.science/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/bundle.json","state":"https://pith.science/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MMGGSHYLRWCMIUCZ5P7MATUEGX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:MMGGSHYLRWCMIUCZ5P7MATUEGX","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":"d2bb124c720b0b8e8abe1e9080509484f82db003cc384bb4677e39f74903d053","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2024-04-21T05:08:56Z","title_canon_sha256":"c0a203fb7878357f4527a84f90e8c37f3f44e48f362cd740d1d2ef65229165c0"},"schema_version":"1.0","source":{"id":"2404.13533","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2404.13533","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"arxiv_version","alias_value":"2404.13533v1","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2404.13533","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_12","alias_value":"MMGGSHYLRWCM","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_16","alias_value":"MMGGSHYLRWCMIUCZ","created_at":"2026-07-05T08:10:33Z"},{"alias_kind":"pith_short_8","alias_value":"MMGGSHYL","created_at":"2026-07-05T08:10:33Z"}],"graph_snapshots":[{"event_id":"sha256:c7c02c3e4c936521d787ad630d97da82d4ac61b106652074cf7378f82f71fdb3","target":"graph","created_at":"2026-07-05T08:10:33Z","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/2404.13533/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Pinch point is a spectral discontinuity found in the neutron diffraction image of spin ice. Similar spectral singularity is commonly observed in a broad range of systems that have a close connection with flat bands. We focus on the electron flat band and its two topologically distinct classes of wavefunction: the compact localized state (CLS), and the non-contractible loop state (NLS). We establish their simple mathematical relationship, showing that different Bloch NLSs can be derived as momentum derivatives of a Bloch CLS, depending on the approaching direction toward the singular point. Thi","authors_text":"Chisa Hotta, Hiroki Nakai, Masafumi Udagawa","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2024-04-21T05:08:56Z","title":"Pinch-point spectral singularity from the interference of topological loop states"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2404.13533","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:a54d1a6e39c0ea1c5eaf59a1ce7e2c6ab63697b0fb4c82ecf2502f37c9c72973","target":"record","created_at":"2026-07-05T08:10:33Z","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":"d2bb124c720b0b8e8abe1e9080509484f82db003cc384bb4677e39f74903d053","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2024-04-21T05:08:56Z","title_canon_sha256":"c0a203fb7878357f4527a84f90e8c37f3f44e48f362cd740d1d2ef65229165c0"},"schema_version":"1.0","source":{"id":"2404.13533","kind":"arxiv","version":1}},"canonical_sha256":"630c691f0b8d84c45059ebfec04e8435c72f85fb997523fd0a6a4a81f6263d48","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"630c691f0b8d84c45059ebfec04e8435c72f85fb997523fd0a6a4a81f6263d48","first_computed_at":"2026-07-05T08:10:33.797831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:10:33.797831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QAxU3hlrlkveiv3ExV23T7oLtdgjTPH+8SDpO8gpsdZAH8zlmie3NaCH1sdDJSznGt5d/vT3e+MOXgwQQD0sBg==","signature_status":"signed_v1","signed_at":"2026-07-05T08:10:33.798227Z","signed_message":"canonical_sha256_bytes"},"source_id":"2404.13533","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a54d1a6e39c0ea1c5eaf59a1ce7e2c6ab63697b0fb4c82ecf2502f37c9c72973","sha256:c7c02c3e4c936521d787ad630d97da82d4ac61b106652074cf7378f82f71fdb3"],"state_sha256":"3e15cbba59850364dbfdefebba02690f8d3db5e28e11848a296a8c1cc396fcd0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MakdQoO5q5IHe+zh3/1xuwZYvFgximEItBBXCLiYum14HOJaNkXk/65WiAWgb+zjsWLOCxPN6xMcP3FyDdX2AA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T17:12:43.570981Z","bundle_sha256":"0f0338c08af0ebcc3a959657d355cb7aec4780290399ea4bbcce05bf8348684e"}}