{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:XQGPIWQAEVN5MBVIAJCW3DCZRN","short_pith_number":"pith:XQGPIWQA","canonical_record":{"source":{"id":"2407.00325","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-06-29T05:58:15Z","cross_cats_sorted":[],"title_canon_sha256":"ed470322e428fe055c826f56fea596850b2d0b86d134a1061ee6569848a856fe","abstract_canon_sha256":"2002d289cf61ceda10df2f5954fff69ca9c2c17da6dd459b03fa2f7044dc74e2"},"schema_version":"1.0"},"canonical_sha256":"bc0cf45a00255bd606a802456d8c598b624e2fb0921ab6ee94b8d74ab7fbaa2f","source":{"kind":"arxiv","id":"2407.00325","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.00325","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"arxiv_version","alias_value":"2407.00325v1","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.00325","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_12","alias_value":"XQGPIWQAEVN5","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_16","alias_value":"XQGPIWQAEVN5MBVI","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_8","alias_value":"XQGPIWQA","created_at":"2026-07-05T08:38:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:XQGPIWQAEVN5MBVIAJCW3DCZRN","target":"record","payload":{"canonical_record":{"source":{"id":"2407.00325","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-06-29T05:58:15Z","cross_cats_sorted":[],"title_canon_sha256":"ed470322e428fe055c826f56fea596850b2d0b86d134a1061ee6569848a856fe","abstract_canon_sha256":"2002d289cf61ceda10df2f5954fff69ca9c2c17da6dd459b03fa2f7044dc74e2"},"schema_version":"1.0"},"canonical_sha256":"bc0cf45a00255bd606a802456d8c598b624e2fb0921ab6ee94b8d74ab7fbaa2f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:38:18.121077Z","signature_b64":"DKRrZ821U2wZkemMYrmgGueka7rNeeokE86oI8fwvyS5PfM4dMBNUrjBPwLWhu+/LsIQsseVtw4GEKhLODK9Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc0cf45a00255bd606a802456d8c598b624e2fb0921ab6ee94b8d74ab7fbaa2f","last_reissued_at":"2026-07-05T08:38:18.120658Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:38:18.120658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2407.00325","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":"2026-07-05T08:38:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"s4B7uTlz0L/PrmHGvAJTa1M87mT2tuJ7YHfzaxNhQOdydQH3MJ0PKgo9M+u0T2l2MF5dDE7QjYVFOA1HHAqpDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T09:09:40.668026Z"},"content_sha256":"b860b9e87e7c46508cae53b9d809c8dd122fd9404c1bbac645ba4190be33b472","schema_version":"1.0","event_id":"sha256:b860b9e87e7c46508cae53b9d809c8dd122fd9404c1bbac645ba4190be33b472"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:XQGPIWQAEVN5MBVIAJCW3DCZRN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Flat band excitons and quantum metric","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"K. T. Law, Xuzhe Ying","submitted_at":"2024-06-29T05:58:15Z","abstract_excerpt":"We discuss the excitons in flat band systems. Quantum metric plays a central role in determining the properties of single exciton excitation as well as the exciton condensate. While the electrons and holes are extremely heavy in flat bands, the excitons (boundstate of an electron-hole pair) could be light and mobile. In particular, we show that the inverse of exciton's effective mass tensor is proportional to the quantum metric tensor. Meanwhile, the flat band excitons have a finite size, lower bounded by the trace of the quantum metric tensor. Given the properties of single exciton excitation"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.00325","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/2407.00325/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":"2026-07-05T08:38:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M6VZ/UgvWI1aQwmjLmoeqnvyssNE62wmd+kUw3dIvxY/KTjE4vwPFuRtqR6A90kHk/7y8+PJ+q25TmZUmXioCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-04T09:09:40.668787Z"},"content_sha256":"612a288dc4c38ab83324c686cd63fa789e6c010a40624f2b9db6f84f7091143d","schema_version":"1.0","event_id":"sha256:612a288dc4c38ab83324c686cd63fa789e6c010a40624f2b9db6f84f7091143d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/bundle.json","state_url":"https://pith.science/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/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":"2026-08-04T09:09:40Z","links":{"resolver":"https://pith.science/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN","bundle":"https://pith.science/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/bundle.json","state":"https://pith.science/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XQGPIWQAEVN5MBVIAJCW3DCZRN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:XQGPIWQAEVN5MBVIAJCW3DCZRN","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":"2002d289cf61ceda10df2f5954fff69ca9c2c17da6dd459b03fa2f7044dc74e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-06-29T05:58:15Z","title_canon_sha256":"ed470322e428fe055c826f56fea596850b2d0b86d134a1061ee6569848a856fe"},"schema_version":"1.0","source":{"id":"2407.00325","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.00325","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"arxiv_version","alias_value":"2407.00325v1","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.00325","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_12","alias_value":"XQGPIWQAEVN5","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_16","alias_value":"XQGPIWQAEVN5MBVI","created_at":"2026-07-05T08:38:18Z"},{"alias_kind":"pith_short_8","alias_value":"XQGPIWQA","created_at":"2026-07-05T08:38:18Z"}],"graph_snapshots":[{"event_id":"sha256:612a288dc4c38ab83324c686cd63fa789e6c010a40624f2b9db6f84f7091143d","target":"graph","created_at":"2026-07-05T08:38:18Z","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/2407.00325/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We discuss the excitons in flat band systems. Quantum metric plays a central role in determining the properties of single exciton excitation as well as the exciton condensate. While the electrons and holes are extremely heavy in flat bands, the excitons (boundstate of an electron-hole pair) could be light and mobile. In particular, we show that the inverse of exciton's effective mass tensor is proportional to the quantum metric tensor. Meanwhile, the flat band excitons have a finite size, lower bounded by the trace of the quantum metric tensor. Given the properties of single exciton excitation","authors_text":"K. T. Law, Xuzhe Ying","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-06-29T05:58:15Z","title":"Flat band excitons and quantum metric"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.00325","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:b860b9e87e7c46508cae53b9d809c8dd122fd9404c1bbac645ba4190be33b472","target":"record","created_at":"2026-07-05T08:38:18Z","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":"2002d289cf61ceda10df2f5954fff69ca9c2c17da6dd459b03fa2f7044dc74e2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-06-29T05:58:15Z","title_canon_sha256":"ed470322e428fe055c826f56fea596850b2d0b86d134a1061ee6569848a856fe"},"schema_version":"1.0","source":{"id":"2407.00325","kind":"arxiv","version":1}},"canonical_sha256":"bc0cf45a00255bd606a802456d8c598b624e2fb0921ab6ee94b8d74ab7fbaa2f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc0cf45a00255bd606a802456d8c598b624e2fb0921ab6ee94b8d74ab7fbaa2f","first_computed_at":"2026-07-05T08:38:18.120658Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:38:18.120658Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DKRrZ821U2wZkemMYrmgGueka7rNeeokE86oI8fwvyS5PfM4dMBNUrjBPwLWhu+/LsIQsseVtw4GEKhLODK9Aw==","signature_status":"signed_v1","signed_at":"2026-07-05T08:38:18.121077Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.00325","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b860b9e87e7c46508cae53b9d809c8dd122fd9404c1bbac645ba4190be33b472","sha256:612a288dc4c38ab83324c686cd63fa789e6c010a40624f2b9db6f84f7091143d"],"state_sha256":"6851cb2a9ca12f369dca1fa45fecceb0cce43e1edaf5ce7be3a336cfde344cc8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6NpFiXrd2zd44+tYT57t8G2q3hY/r2tfTZTdBylvUJErnXpNj/Hwz+g/1kpdOYJY3I1Ytss0xk3Kysykc4YMCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-04T09:09:40.674614Z","bundle_sha256":"89ab7cc71c2e194ba5e3b5180d13fc6ada1670bf30391843575d64d083bc0fbf"}}