{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:DZ4KNN3IWTSMUC5NJ77B3RVK22","short_pith_number":"pith:DZ4KNN3I","canonical_record":{"source":{"id":"1811.02362","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-11-06T14:19:47Z","cross_cats_sorted":[],"title_canon_sha256":"c5290d466819bfee92dfe6ea150d5c4697a724550f51c761edd5f1d153c9d58f","abstract_canon_sha256":"6fc3779765277da4635bdd7fa18ee027ed006168010d16f03e8dbd3a020fa3f4"},"schema_version":"1.0"},"canonical_sha256":"1e78a6b768b4e4ca0bad4ffe1dc6aad6accab7a0715b19011616617a49c7bb5d","source":{"kind":"arxiv","id":"1811.02362","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.02362","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"arxiv_version","alias_value":"1811.02362v1","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.02362","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"pith_short_12","alias_value":"DZ4KNN3IWTSM","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DZ4KNN3IWTSMUC5N","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DZ4KNN3I","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:DZ4KNN3IWTSMUC5NJ77B3RVK22","target":"record","payload":{"canonical_record":{"source":{"id":"1811.02362","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-11-06T14:19:47Z","cross_cats_sorted":[],"title_canon_sha256":"c5290d466819bfee92dfe6ea150d5c4697a724550f51c761edd5f1d153c9d58f","abstract_canon_sha256":"6fc3779765277da4635bdd7fa18ee027ed006168010d16f03e8dbd3a020fa3f4"},"schema_version":"1.0"},"canonical_sha256":"1e78a6b768b4e4ca0bad4ffe1dc6aad6accab7a0715b19011616617a49c7bb5d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:46.920717Z","signature_b64":"dusuuZ3O9oU9rwCtaDJDcgFGDv4BAEnDtHxoeyruv+QNnFpKZOCknzHGpYQT6GlpG2YMUGcevUKkg78Ozl18BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1e78a6b768b4e4ca0bad4ffe1dc6aad6accab7a0715b19011616617a49c7bb5d","last_reissued_at":"2026-05-18T00:00:46.920305Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:46.920305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.02362","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":"2026-05-18T00:00:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bVl+hFwgZ54pywyoVcO1Mqa3McX0r2vo42zdPSd96x8Vqdv/Lz6bJfKTRBR5KCcpwqoUyn2rWdpyvp3eQGC3Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T13:34:47.186701Z"},"content_sha256":"d4b83f8f1f0de3aba02c45f39e93c6f56b284c383cb457897f61d7fde5be3f17","schema_version":"1.0","event_id":"sha256:d4b83f8f1f0de3aba02c45f39e93c6f56b284c383cb457897f61d7fde5be3f17"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:DZ4KNN3IWTSMUC5NJ77B3RVK22","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical vs electronic gap of hafnia by ab initio Bethe-Salpeter equation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alberto Dragoni, Beno\\^it Skl\\'enard, Fran\\c{c}ois Triozon, Valerio Olevano","submitted_at":"2018-11-06T14:19:47Z","abstract_excerpt":"We present first-principles many-body perturbation theory calculations of the quasiparticle electronic structure and of the optical response of HfO$_2$ polymorphs. We use the $GW$ approximation including core electrons by the projector augmented wave (PAW) method and performing a quasiparticle self-consistency also on wavefunctions (QS$GW$). In addition, we solve the Bethe-Salpeter equation on top of $GW$ to calculate optical properties including excitonic effects. For monoclinic HfO$_2$ we find a fundamental band gap of $E_g = 6.33$ eV (with the direct band gap at $E_g^d = 6.41$ eV), and an e"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.02362","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":""},"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":"2026-05-18T00:00:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LIgYCg6AORh1Y4Ns/I572VJG5B9QGIpJocPcn8CX56Xl3+Lu6ZRTt95WMkHmUdVY1jhCoVOSoX8oT29mjawxAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T13:34:47.187445Z"},"content_sha256":"8224ce6d7165986af1b18fdb56f79dcace3732f1fb65ebed12aadbcd5bd22d14","schema_version":"1.0","event_id":"sha256:8224ce6d7165986af1b18fdb56f79dcace3732f1fb65ebed12aadbcd5bd22d14"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/bundle.json","state_url":"https://pith.science/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/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":"2026-05-31T13:34:47Z","links":{"resolver":"https://pith.science/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22","bundle":"https://pith.science/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/bundle.json","state":"https://pith.science/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DZ4KNN3IWTSMUC5NJ77B3RVK22/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:DZ4KNN3IWTSMUC5NJ77B3RVK22","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":"6fc3779765277da4635bdd7fa18ee027ed006168010d16f03e8dbd3a020fa3f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-11-06T14:19:47Z","title_canon_sha256":"c5290d466819bfee92dfe6ea150d5c4697a724550f51c761edd5f1d153c9d58f"},"schema_version":"1.0","source":{"id":"1811.02362","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.02362","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"arxiv_version","alias_value":"1811.02362v1","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.02362","created_at":"2026-05-18T00:00:46Z"},{"alias_kind":"pith_short_12","alias_value":"DZ4KNN3IWTSM","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"DZ4KNN3IWTSMUC5N","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"DZ4KNN3I","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:8224ce6d7165986af1b18fdb56f79dcace3732f1fb65ebed12aadbcd5bd22d14","target":"graph","created_at":"2026-05-18T00:00:46Z","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"},"paper":{"abstract_excerpt":"We present first-principles many-body perturbation theory calculations of the quasiparticle electronic structure and of the optical response of HfO$_2$ polymorphs. We use the $GW$ approximation including core electrons by the projector augmented wave (PAW) method and performing a quasiparticle self-consistency also on wavefunctions (QS$GW$). In addition, we solve the Bethe-Salpeter equation on top of $GW$ to calculate optical properties including excitonic effects. For monoclinic HfO$_2$ we find a fundamental band gap of $E_g = 6.33$ eV (with the direct band gap at $E_g^d = 6.41$ eV), and an e","authors_text":"Alberto Dragoni, Beno\\^it Skl\\'enard, Fran\\c{c}ois Triozon, Valerio Olevano","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-11-06T14:19:47Z","title":"Optical vs electronic gap of hafnia by ab initio Bethe-Salpeter equation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.02362","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:d4b83f8f1f0de3aba02c45f39e93c6f56b284c383cb457897f61d7fde5be3f17","target":"record","created_at":"2026-05-18T00:00:46Z","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":"6fc3779765277da4635bdd7fa18ee027ed006168010d16f03e8dbd3a020fa3f4","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-11-06T14:19:47Z","title_canon_sha256":"c5290d466819bfee92dfe6ea150d5c4697a724550f51c761edd5f1d153c9d58f"},"schema_version":"1.0","source":{"id":"1811.02362","kind":"arxiv","version":1}},"canonical_sha256":"1e78a6b768b4e4ca0bad4ffe1dc6aad6accab7a0715b19011616617a49c7bb5d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1e78a6b768b4e4ca0bad4ffe1dc6aad6accab7a0715b19011616617a49c7bb5d","first_computed_at":"2026-05-18T00:00:46.920305Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:46.920305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dusuuZ3O9oU9rwCtaDJDcgFGDv4BAEnDtHxoeyruv+QNnFpKZOCknzHGpYQT6GlpG2YMUGcevUKkg78Ozl18BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:46.920717Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.02362","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4b83f8f1f0de3aba02c45f39e93c6f56b284c383cb457897f61d7fde5be3f17","sha256:8224ce6d7165986af1b18fdb56f79dcace3732f1fb65ebed12aadbcd5bd22d14"],"state_sha256":"2fe74314d43277ed7288d5548cf55a42177b3d081f5acd82b02e24ef15530a41"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"l3iVEJQrdq+DrbAEb/KqPQm1DehaHUM8dT11Cims9DgSk7kSNRnzMN4XlVFQPxadETDd4m17RgdWec9jZU9HBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T13:34:47.190797Z","bundle_sha256":"a151b54c527e077a40a2f64add2501c99286ee8e8b2685eeb57f471e42664a29"}}