{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:LBSBGUZ7X3EGHEJEGC5BIGSIE6","short_pith_number":"pith:LBSBGUZ7","canonical_record":{"source":{"id":"1901.05667","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-17T07:56:16Z","cross_cats_sorted":[],"title_canon_sha256":"b2f6dd64e730c132f51e1f8a54b23285c11434d2dc56b7d156eaeff0998e89b8","abstract_canon_sha256":"dd460bc2d9722e0828ee88b8aef344418521cd1da81ab92fd3c34ef138229ae6"},"schema_version":"1.0"},"canonical_sha256":"586413533fbec863912430ba141a4827a22366a88f112fcb9dc77127e62c1ecd","source":{"kind":"arxiv","id":"1901.05667","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.05667","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"arxiv_version","alias_value":"1901.05667v1","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05667","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"pith_short_12","alias_value":"LBSBGUZ7X3EG","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LBSBGUZ7X3EGHEJE","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LBSBGUZ7","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:LBSBGUZ7X3EGHEJEGC5BIGSIE6","target":"record","payload":{"canonical_record":{"source":{"id":"1901.05667","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-17T07:56:16Z","cross_cats_sorted":[],"title_canon_sha256":"b2f6dd64e730c132f51e1f8a54b23285c11434d2dc56b7d156eaeff0998e89b8","abstract_canon_sha256":"dd460bc2d9722e0828ee88b8aef344418521cd1da81ab92fd3c34ef138229ae6"},"schema_version":"1.0"},"canonical_sha256":"586413533fbec863912430ba141a4827a22366a88f112fcb9dc77127e62c1ecd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:33.399965Z","signature_b64":"yvlgsIBPYSOQsr1uUTGEarKnPSwSzGhinYeozQZgiBfZ6VW/zND9nUHSG+kAkDe1s/+JX80DStkRbdpM39iZCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"586413533fbec863912430ba141a4827a22366a88f112fcb9dc77127e62c1ecd","last_reissued_at":"2026-05-17T23:50:33.399297Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:33.399297Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.05667","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":"2026-05-17T23:50:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rX3J5mB7PwPSG9VJnEVmJnB/A+cWbGqiNYAyYuJoaFuEWhjKJaPbaCphL9dS1V101Lr9ERDE2L0HPM87i+RtDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:19:25.129929Z"},"content_sha256":"97dc4a3eb127923652ddf0dc82d31ce271753abaca9a5a18292f7e4b807424bf","schema_version":"1.0","event_id":"sha256:97dc4a3eb127923652ddf0dc82d31ce271753abaca9a5a18292f7e4b807424bf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:LBSBGUZ7X3EGHEJEGC5BIGSIE6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Native point defects and carbon clusters in 4H-SiC: A hybrid functional study","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Fumiyasu Oba, Kou Harada, Takuma Kobayashi, Yu-ichiro Matsushita, Yu Kumagai","submitted_at":"2019-01-17T07:56:16Z","abstract_excerpt":"We report first-principles calculations that clarify the formation energies and charge transition levels of native point defects and carbon clusters in the 4H polytype of silicon carbide (4H-SiC) under a carbon-rich condition. We applied a hybrid functional that reproduces the experimental bandgap of SiC well and offers reliable defect properties. For point defects, we investigated single vacancies, antisites, and interstitials of Si and C on relevant sites. For carbon clusters, we systematically introduced two additional C atoms into the perfect 4H-SiC lattice with and without removing Si ato"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05667","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":"2026-05-17T23:50:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8zM121/ArTLc3YvE1YyUcGwGqjdC6cmA4z0XLniuM09IGHDC1OXbaSQc027yFCKxEAVXFr5RjGnphpmIOn0XCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T18:19:25.130325Z"},"content_sha256":"b5f77913961282ad1d25cd30d2739c00882005ef26e81eef85ea909f4c67eada","schema_version":"1.0","event_id":"sha256:b5f77913961282ad1d25cd30d2739c00882005ef26e81eef85ea909f4c67eada"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/bundle.json","state_url":"https://pith.science/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/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":"2026-05-30T18:19:25Z","links":{"resolver":"https://pith.science/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6","bundle":"https://pith.science/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/bundle.json","state":"https://pith.science/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LBSBGUZ7X3EGHEJEGC5BIGSIE6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:LBSBGUZ7X3EGHEJEGC5BIGSIE6","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":"dd460bc2d9722e0828ee88b8aef344418521cd1da81ab92fd3c34ef138229ae6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-17T07:56:16Z","title_canon_sha256":"b2f6dd64e730c132f51e1f8a54b23285c11434d2dc56b7d156eaeff0998e89b8"},"schema_version":"1.0","source":{"id":"1901.05667","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.05667","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"arxiv_version","alias_value":"1901.05667v1","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.05667","created_at":"2026-05-17T23:50:33Z"},{"alias_kind":"pith_short_12","alias_value":"LBSBGUZ7X3EG","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"LBSBGUZ7X3EGHEJE","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"LBSBGUZ7","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:b5f77913961282ad1d25cd30d2739c00882005ef26e81eef85ea909f4c67eada","target":"graph","created_at":"2026-05-17T23:50:33Z","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"},"paper":{"abstract_excerpt":"We report first-principles calculations that clarify the formation energies and charge transition levels of native point defects and carbon clusters in the 4H polytype of silicon carbide (4H-SiC) under a carbon-rich condition. We applied a hybrid functional that reproduces the experimental bandgap of SiC well and offers reliable defect properties. For point defects, we investigated single vacancies, antisites, and interstitials of Si and C on relevant sites. For carbon clusters, we systematically introduced two additional C atoms into the perfect 4H-SiC lattice with and without removing Si ato","authors_text":"Fumiyasu Oba, Kou Harada, Takuma Kobayashi, Yu-ichiro Matsushita, Yu Kumagai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-17T07:56:16Z","title":"Native point defects and carbon clusters in 4H-SiC: A hybrid functional study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.05667","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":"sha256:97dc4a3eb127923652ddf0dc82d31ce271753abaca9a5a18292f7e4b807424bf","target":"record","created_at":"2026-05-17T23:50:33Z","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":"dd460bc2d9722e0828ee88b8aef344418521cd1da81ab92fd3c34ef138229ae6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-17T07:56:16Z","title_canon_sha256":"b2f6dd64e730c132f51e1f8a54b23285c11434d2dc56b7d156eaeff0998e89b8"},"schema_version":"1.0","source":{"id":"1901.05667","kind":"arxiv","version":1}},"canonical_sha256":"586413533fbec863912430ba141a4827a22366a88f112fcb9dc77127e62c1ecd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"586413533fbec863912430ba141a4827a22366a88f112fcb9dc77127e62c1ecd","first_computed_at":"2026-05-17T23:50:33.399297Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:33.399297Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"yvlgsIBPYSOQsr1uUTGEarKnPSwSzGhinYeozQZgiBfZ6VW/zND9nUHSG+kAkDe1s/+JX80DStkRbdpM39iZCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:33.399965Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.05667","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:97dc4a3eb127923652ddf0dc82d31ce271753abaca9a5a18292f7e4b807424bf","sha256:b5f77913961282ad1d25cd30d2739c00882005ef26e81eef85ea909f4c67eada"],"state_sha256":"bec46f53790e413e023673825b252fa5c11508a480ca615cabfacc81a9798d12"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LQqaUxSg+kA82h1pAEeE9tCZ3y3/0K5Rot3EG96AAXD+0h5+v086BMm/BrRodsz47vYEtU+eQ6UUHR5Db0NCBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T18:19:25.132345Z","bundle_sha256":"c68e8da542b28d75662f2acd9fe4a379a689bae24ec5f83431d160966e127d72"}}