{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2022:VTBJ6UE2EFZZ54CONUSS2NK2SK","short_pith_number":"pith:VTBJ6UE2","canonical_record":{"source":{"id":"2211.02033","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-11-03T17:52:19Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"079adf33ca74ee2e0ee48131d4c422fde15449097ac2b1220b44f90046eefb79","abstract_canon_sha256":"e4cbab3e2a7334b92e76237910000973f88856d1a90476a65afc31f30b4e1762"},"schema_version":"1.0"},"canonical_sha256":"acc29f509a21739ef04e6d252d355a9299daef2196f6f180c2778233638e07a3","source":{"kind":"arxiv","id":"2211.02033","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2211.02033","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"arxiv_version","alias_value":"2211.02033v1","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.02033","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_12","alias_value":"VTBJ6UE2EFZZ","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_16","alias_value":"VTBJ6UE2EFZZ54CO","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_8","alias_value":"VTBJ6UE2","created_at":"2026-07-05T05:13:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2022:VTBJ6UE2EFZZ54CONUSS2NK2SK","target":"record","payload":{"canonical_record":{"source":{"id":"2211.02033","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-11-03T17:52:19Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"079adf33ca74ee2e0ee48131d4c422fde15449097ac2b1220b44f90046eefb79","abstract_canon_sha256":"e4cbab3e2a7334b92e76237910000973f88856d1a90476a65afc31f30b4e1762"},"schema_version":"1.0"},"canonical_sha256":"acc29f509a21739ef04e6d252d355a9299daef2196f6f180c2778233638e07a3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:13:02.758739Z","signature_b64":"wIFa2TQQfjl7L0YfCSfnwxRTX9MPx3VLyn9bJno6Jrkl3wQIjMj+k0IbKRw3fkcG4JKyBq00X33bMb7VkqmaDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"acc29f509a21739ef04e6d252d355a9299daef2196f6f180c2778233638e07a3","last_reissued_at":"2026-07-05T05:13:02.758301Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:13:02.758301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2211.02033","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":"2026-07-05T05:13:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hmHmpFQafGQRwO/HJ2wW4Ow+jK4SHmyTdunN3GlWgVmMw2F744zI/cizgvR+xqVDHB+uMfdcSr3UCLpRS+gABA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T15:44:09.060024Z"},"content_sha256":"5434eda1cc306e1cece147d807036a106e56f06f94edcea82a1bdfcadb7370ca","schema_version":"1.0","event_id":"sha256:5434eda1cc306e1cece147d807036a106e56f06f94edcea82a1bdfcadb7370ca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2022:VTBJ6UE2EFZZ54CONUSS2NK2SK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Deepankar Sri Gyan, Ho Nyung Lee, Hyeon Jun Lee, Intae Eom, Jerome Carnis, Ji Young Jo, Jun young Lee, Kyung Sook Kim, Minseok Kim, Paul G. Evans, Sae Hwan Chun, Sang-Youn Park, Sanjith Unithrattil, Sunam Kim, Tae Yeon Kim, Youngjun Ahn","submitted_at":"2022-11-03T17:52:19Z","abstract_excerpt":"Above-bandgap femtosecond optical excitation of a ferroelectric/dielectric BaTiO3/CaTiO3 superlattice leads to structural responses that are a consequence of the screening of the strong electrostatic coupling between the component layers. Time-resolved x-ray free-electron laser diffraction shows that the structural response to optical excitation includes a net lattice expansion of the superlattice consistent with depolarization-field screening driven by the photoexcited charge carriers. The depolarization-field-screening-driven expansion is separate from a photoacoustic pulse launched from the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.02033","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/2211.02033/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":"2026-07-05T05:13:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j+37lU5erCB51c1SsrFVyQgwfpEACBMODkEQ7GPCBSSKFqxfOIfYOel1+DroIvmBTZps3kARZDqk7xi4RdU4Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T15:44:09.060415Z"},"content_sha256":"10a749444a104d736f6dfa136be6a5c9bf2e40df45d71d9100eb24c063ff4bff","schema_version":"1.0","event_id":"sha256:10a749444a104d736f6dfa136be6a5c9bf2e40df45d71d9100eb24c063ff4bff"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/bundle.json","state_url":"https://pith.science/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/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":"2026-07-07T15:44:09Z","links":{"resolver":"https://pith.science/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK","bundle":"https://pith.science/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/bundle.json","state":"https://pith.science/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VTBJ6UE2EFZZ54CONUSS2NK2SK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:VTBJ6UE2EFZZ54CONUSS2NK2SK","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":"e4cbab3e2a7334b92e76237910000973f88856d1a90476a65afc31f30b4e1762","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-11-03T17:52:19Z","title_canon_sha256":"079adf33ca74ee2e0ee48131d4c422fde15449097ac2b1220b44f90046eefb79"},"schema_version":"1.0","source":{"id":"2211.02033","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2211.02033","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"arxiv_version","alias_value":"2211.02033v1","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2211.02033","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_12","alias_value":"VTBJ6UE2EFZZ","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_16","alias_value":"VTBJ6UE2EFZZ54CO","created_at":"2026-07-05T05:13:02Z"},{"alias_kind":"pith_short_8","alias_value":"VTBJ6UE2","created_at":"2026-07-05T05:13:02Z"}],"graph_snapshots":[{"event_id":"sha256:10a749444a104d736f6dfa136be6a5c9bf2e40df45d71d9100eb24c063ff4bff","target":"graph","created_at":"2026-07-05T05:13:02Z","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/2211.02033/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Above-bandgap femtosecond optical excitation of a ferroelectric/dielectric BaTiO3/CaTiO3 superlattice leads to structural responses that are a consequence of the screening of the strong electrostatic coupling between the component layers. Time-resolved x-ray free-electron laser diffraction shows that the structural response to optical excitation includes a net lattice expansion of the superlattice consistent with depolarization-field screening driven by the photoexcited charge carriers. The depolarization-field-screening-driven expansion is separate from a photoacoustic pulse launched from the","authors_text":"Deepankar Sri Gyan, Ho Nyung Lee, Hyeon Jun Lee, Intae Eom, Jerome Carnis, Ji Young Jo, Jun young Lee, Kyung Sook Kim, Minseok Kim, Paul G. Evans, Sae Hwan Chun, Sang-Youn Park, Sanjith Unithrattil, Sunam Kim, Tae Yeon Kim, Youngjun Ahn","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-11-03T17:52:19Z","title":"Optically Induced Picosecond Lattice Compression in the Dielectric Component of a Strongly Coupled Ferroelectric/Dielectric Superlattice"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2211.02033","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":"sha256:5434eda1cc306e1cece147d807036a106e56f06f94edcea82a1bdfcadb7370ca","target":"record","created_at":"2026-07-05T05:13:02Z","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":"e4cbab3e2a7334b92e76237910000973f88856d1a90476a65afc31f30b4e1762","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2022-11-03T17:52:19Z","title_canon_sha256":"079adf33ca74ee2e0ee48131d4c422fde15449097ac2b1220b44f90046eefb79"},"schema_version":"1.0","source":{"id":"2211.02033","kind":"arxiv","version":1}},"canonical_sha256":"acc29f509a21739ef04e6d252d355a9299daef2196f6f180c2778233638e07a3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"acc29f509a21739ef04e6d252d355a9299daef2196f6f180c2778233638e07a3","first_computed_at":"2026-07-05T05:13:02.758301Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:13:02.758301Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wIFa2TQQfjl7L0YfCSfnwxRTX9MPx3VLyn9bJno6Jrkl3wQIjMj+k0IbKRw3fkcG4JKyBq00X33bMb7VkqmaDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T05:13:02.758739Z","signed_message":"canonical_sha256_bytes"},"source_id":"2211.02033","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5434eda1cc306e1cece147d807036a106e56f06f94edcea82a1bdfcadb7370ca","sha256:10a749444a104d736f6dfa136be6a5c9bf2e40df45d71d9100eb24c063ff4bff"],"state_sha256":"d121b19b39c8215f94f690e899a376764f937b02f72e206ad97c7e163e6891c6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QjPSrQ/xxwLKwHM0ukI7A/PBjLEVT5pl2y5s5WxOyjMcJBC2jXN9vbH3mFwVahaTd/BxtwHmFBYPmjm/AAM+Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T15:44:09.062393Z","bundle_sha256":"4ff9f594143ff5496e82aba40faaa02466df9e470148d3cd4651d2e4434d6fe5"}}