{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:7GP7FD6YZCSDK2XKB24TUV344Y","short_pith_number":"pith:7GP7FD6Y","canonical_record":{"source":{"id":"2109.09021","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-09-18T22:05:30Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"815547b58ad819bd49cee23212f69e594d83163d9fa8fc3b165ef552d63cf888","abstract_canon_sha256":"e59047660bf48d0bea45f9e7f721a4b6f65d5096edc8be95f77766b3164bfe00"},"schema_version":"1.0"},"canonical_sha256":"f99ff28fd8c8a4356aea0eb93a577ce6390253a5a07eb92631221dc5db4870d0","source":{"kind":"arxiv","id":"2109.09021","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.09021","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"arxiv_version","alias_value":"2109.09021v1","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.09021","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_12","alias_value":"7GP7FD6YZCSD","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_16","alias_value":"7GP7FD6YZCSDK2XK","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_8","alias_value":"7GP7FD6Y","created_at":"2026-07-05T03:15:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:7GP7FD6YZCSDK2XKB24TUV344Y","target":"record","payload":{"canonical_record":{"source":{"id":"2109.09021","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-09-18T22:05:30Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"815547b58ad819bd49cee23212f69e594d83163d9fa8fc3b165ef552d63cf888","abstract_canon_sha256":"e59047660bf48d0bea45f9e7f721a4b6f65d5096edc8be95f77766b3164bfe00"},"schema_version":"1.0"},"canonical_sha256":"f99ff28fd8c8a4356aea0eb93a577ce6390253a5a07eb92631221dc5db4870d0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:15:40.620680Z","signature_b64":"pQ6lSKIztpcCBixY+tEYBWhWh875PMIRNFnCeHzQr5XsrX0bNrfYcxB3EaqiJu2iVKmzQYQO6YADuiSs25ueAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f99ff28fd8c8a4356aea0eb93a577ce6390253a5a07eb92631221dc5db4870d0","last_reissued_at":"2026-07-05T03:15:40.620218Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:15:40.620218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.09021","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":"2026-07-05T03:15:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cbLRfo9GY3ig4y4YNAmpsAlpbm1K623awg4nZAAEiE1n86YBntHhP+ciHHD0euj9OcC+5Qzo4MKZnU01Qjs0Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T20:20:51.801511Z"},"content_sha256":"1098702d1f7711ca50fcd92240f8dad247f9a04955f10ebf6ac71f3b64a4137f","schema_version":"1.0","event_id":"sha256:1098702d1f7711ca50fcd92240f8dad247f9a04955f10ebf6ac71f3b64a4137f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:7GP7FD6YZCSDK2XKB24TUV344Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Franz-Keldysh and Stark Effects in Two-Dimensional Metal Halide Perovskites","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"C. Emma McClure, John S. Colton, Kameron R. Hansen, Luisa Whittaker-Brooks","submitted_at":"2021-09-18T22:05:30Z","abstract_excerpt":"As the field of metal halide perovskites (MHP) matures, state-of-the-art techniques to measure basic properties such as the band gap and exciton binding energy continue to produce inconsistent values. This issue is persistent even for 2D MHPs wherein the large separation between exciton and continuum states should make such measurements more straightforward. In this study, we revert to the established theory of a 2D Wannier exciton in a uniform electric field to analyze the electroabsorption response of an archetypal 2D MHP system, phenethylammonium lead iodide (PEA2PbI4). The high level of ag"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.09021","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/2109.09021/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":"2026-07-05T03:15:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JjwkDtYlVHuSD3Np07kZDpBHayTcVeZVDCEryzhhlqA99Z1NrFYlNNvRssnX8vWoPdJj/T2b6/GXr/4NcJaVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-10T20:20:51.801883Z"},"content_sha256":"d3291283e5e322956f13c5eecb7c5ddccba834eff7888e96d25279627a7af0c5","schema_version":"1.0","event_id":"sha256:d3291283e5e322956f13c5eecb7c5ddccba834eff7888e96d25279627a7af0c5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7GP7FD6YZCSDK2XKB24TUV344Y/bundle.json","state_url":"https://pith.science/pith/7GP7FD6YZCSDK2XKB24TUV344Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7GP7FD6YZCSDK2XKB24TUV344Y/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":"2026-07-10T20:20:51Z","links":{"resolver":"https://pith.science/pith/7GP7FD6YZCSDK2XKB24TUV344Y","bundle":"https://pith.science/pith/7GP7FD6YZCSDK2XKB24TUV344Y/bundle.json","state":"https://pith.science/pith/7GP7FD6YZCSDK2XKB24TUV344Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7GP7FD6YZCSDK2XKB24TUV344Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:7GP7FD6YZCSDK2XKB24TUV344Y","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":"e59047660bf48d0bea45f9e7f721a4b6f65d5096edc8be95f77766b3164bfe00","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-09-18T22:05:30Z","title_canon_sha256":"815547b58ad819bd49cee23212f69e594d83163d9fa8fc3b165ef552d63cf888"},"schema_version":"1.0","source":{"id":"2109.09021","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.09021","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"arxiv_version","alias_value":"2109.09021v1","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.09021","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_12","alias_value":"7GP7FD6YZCSD","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_16","alias_value":"7GP7FD6YZCSDK2XK","created_at":"2026-07-05T03:15:40Z"},{"alias_kind":"pith_short_8","alias_value":"7GP7FD6Y","created_at":"2026-07-05T03:15:40Z"}],"graph_snapshots":[{"event_id":"sha256:d3291283e5e322956f13c5eecb7c5ddccba834eff7888e96d25279627a7af0c5","target":"graph","created_at":"2026-07-05T03:15:40Z","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/2109.09021/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As the field of metal halide perovskites (MHP) matures, state-of-the-art techniques to measure basic properties such as the band gap and exciton binding energy continue to produce inconsistent values. This issue is persistent even for 2D MHPs wherein the large separation between exciton and continuum states should make such measurements more straightforward. In this study, we revert to the established theory of a 2D Wannier exciton in a uniform electric field to analyze the electroabsorption response of an archetypal 2D MHP system, phenethylammonium lead iodide (PEA2PbI4). The high level of ag","authors_text":"C. Emma McClure, John S. Colton, Kameron R. Hansen, Luisa Whittaker-Brooks","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-09-18T22:05:30Z","title":"Franz-Keldysh and Stark Effects in Two-Dimensional Metal Halide Perovskites"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.09021","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":"sha256:1098702d1f7711ca50fcd92240f8dad247f9a04955f10ebf6ac71f3b64a4137f","target":"record","created_at":"2026-07-05T03:15:40Z","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":"e59047660bf48d0bea45f9e7f721a4b6f65d5096edc8be95f77766b3164bfe00","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-09-18T22:05:30Z","title_canon_sha256":"815547b58ad819bd49cee23212f69e594d83163d9fa8fc3b165ef552d63cf888"},"schema_version":"1.0","source":{"id":"2109.09021","kind":"arxiv","version":1}},"canonical_sha256":"f99ff28fd8c8a4356aea0eb93a577ce6390253a5a07eb92631221dc5db4870d0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f99ff28fd8c8a4356aea0eb93a577ce6390253a5a07eb92631221dc5db4870d0","first_computed_at":"2026-07-05T03:15:40.620218Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:15:40.620218Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"pQ6lSKIztpcCBixY+tEYBWhWh875PMIRNFnCeHzQr5XsrX0bNrfYcxB3EaqiJu2iVKmzQYQO6YADuiSs25ueAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:15:40.620680Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.09021","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1098702d1f7711ca50fcd92240f8dad247f9a04955f10ebf6ac71f3b64a4137f","sha256:d3291283e5e322956f13c5eecb7c5ddccba834eff7888e96d25279627a7af0c5"],"state_sha256":"e6216fa5d0f4ee408db45fe845ece2748473131501ccc44e8cc40023769f3db8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4HTtC5i5YsCBtxxekQfevMkKwRJ8xi+kzjbma5gPqDyPI+7bOwOaa3KNlET7I4hR512Y1cwrol05iXPFwl2kDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-10T20:20:51.804038Z","bundle_sha256":"bb05ae5e0eecd314fe5ad346ac6fadaa02561d351fc906903330aae215732cda"}}