{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:P54X5LKEOYHFG45DFYU4VYNLAQ","short_pith_number":"pith:P54X5LKE","canonical_record":{"source":{"id":"1601.00420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-04T09:30:19Z","cross_cats_sorted":[],"title_canon_sha256":"0794cef248dc4165acc73a26efac976e5dda7831c5fe1deca12bafcf077ca997","abstract_canon_sha256":"89866c98bfa88ed0e883954224d6b8d5f80d5c0599db3647ae6ae1613aff0eba"},"schema_version":"1.0"},"canonical_sha256":"7f797ead44760e5373a32e29cae1ab042ea499b94cf6b8db96f9e9a36d05d283","source":{"kind":"arxiv","id":"1601.00420","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.00420","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"1601.00420v1","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.00420","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"P54X5LKEOYHF","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"P54X5LKEOYHFG45D","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"P54X5LKE","created_at":"2026-05-18T12:30:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:P54X5LKEOYHFG45DFYU4VYNLAQ","target":"record","payload":{"canonical_record":{"source":{"id":"1601.00420","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-04T09:30:19Z","cross_cats_sorted":[],"title_canon_sha256":"0794cef248dc4165acc73a26efac976e5dda7831c5fe1deca12bafcf077ca997","abstract_canon_sha256":"89866c98bfa88ed0e883954224d6b8d5f80d5c0599db3647ae6ae1613aff0eba"},"schema_version":"1.0"},"canonical_sha256":"7f797ead44760e5373a32e29cae1ab042ea499b94cf6b8db96f9e9a36d05d283","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:18:29.797123Z","signature_b64":"VMnQ8b56+hX4oML+8fQL2Y7EXZWnyBsoSeQS8EkGY3E086J9nL9zUIn1W3ciIVfRpzQsM8/ypjs1gVCDgRwhCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7f797ead44760e5373a32e29cae1ab042ea499b94cf6b8db96f9e9a36d05d283","last_reissued_at":"2026-05-18T01:18:29.796596Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:18:29.796596Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.00420","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":"2026-05-18T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aB2qYq9mglTQMxcT/7iWMkSWdLi5jE9vw2EwuogjWLYe6QXXj1wK6E2+aqFmGnEWOQCJvx/FBly42pybdPLSAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:10:12.954581Z"},"content_sha256":"ef30031ae7b7ac3170e5523e8c8d262a01c7b515b314ea234890a425148ea30f","schema_version":"1.0","event_id":"sha256:ef30031ae7b7ac3170e5523e8c8d262a01c7b515b314ea234890a425148ea30f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:P54X5LKEOYHFG45DFYU4VYNLAQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Direct band gap carbon superlattices with efficient optical transition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"In-Ho Lee, Jooyoung Lee, K. J. Chang, Sunghyun Kim, Young Jun Oh","submitted_at":"2016-01-04T09:30:19Z","abstract_excerpt":"We report pure carbon-based superlattices that exhibit direct band gaps and excellent optical absorption and emission properties at the threshold energy. The structures are nearly identical to that of cubic diamond except that defective layers characterized by five- and seven-membered rings are intercalated in the diamond lattice. The direct band gaps lie in the range of 5.6~5.9 eV, corresponding to wavelengths of 210~221 nm. The dipole matrix elements of direct optical transition are comparable to that of GaN, suggesting that the superlattices are promising materials as an efficient deep ultr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.00420","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":"2026-05-18T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aTmAk+OOQh2pLgRmKRsodWT865aXMM9wPL6HsOfpy2IwX/x6U4q15rBwrkeSvBuzpZav2AFS7dq3L/cJv/FfDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T00:10:12.954927Z"},"content_sha256":"6fcc1a35bc07b9d6c85603c18bc7d67fde62e4fd35eeee66fe45ad3d00e59644","schema_version":"1.0","event_id":"sha256:6fcc1a35bc07b9d6c85603c18bc7d67fde62e4fd35eeee66fe45ad3d00e59644"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/bundle.json","state_url":"https://pith.science/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/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":"2026-05-31T00:10:12Z","links":{"resolver":"https://pith.science/pith/P54X5LKEOYHFG45DFYU4VYNLAQ","bundle":"https://pith.science/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/bundle.json","state":"https://pith.science/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P54X5LKEOYHFG45DFYU4VYNLAQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:P54X5LKEOYHFG45DFYU4VYNLAQ","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":"89866c98bfa88ed0e883954224d6b8d5f80d5c0599db3647ae6ae1613aff0eba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-04T09:30:19Z","title_canon_sha256":"0794cef248dc4165acc73a26efac976e5dda7831c5fe1deca12bafcf077ca997"},"schema_version":"1.0","source":{"id":"1601.00420","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.00420","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"1601.00420v1","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.00420","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"P54X5LKEOYHF","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_16","alias_value":"P54X5LKEOYHFG45D","created_at":"2026-05-18T12:30:36Z"},{"alias_kind":"pith_short_8","alias_value":"P54X5LKE","created_at":"2026-05-18T12:30:36Z"}],"graph_snapshots":[{"event_id":"sha256:6fcc1a35bc07b9d6c85603c18bc7d67fde62e4fd35eeee66fe45ad3d00e59644","target":"graph","created_at":"2026-05-18T01:18:29Z","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 pure carbon-based superlattices that exhibit direct band gaps and excellent optical absorption and emission properties at the threshold energy. The structures are nearly identical to that of cubic diamond except that defective layers characterized by five- and seven-membered rings are intercalated in the diamond lattice. The direct band gaps lie in the range of 5.6~5.9 eV, corresponding to wavelengths of 210~221 nm. The dipole matrix elements of direct optical transition are comparable to that of GaN, suggesting that the superlattices are promising materials as an efficient deep ultr","authors_text":"In-Ho Lee, Jooyoung Lee, K. J. Chang, Sunghyun Kim, Young Jun Oh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-04T09:30:19Z","title":"Direct band gap carbon superlattices with efficient optical transition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.00420","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:ef30031ae7b7ac3170e5523e8c8d262a01c7b515b314ea234890a425148ea30f","target":"record","created_at":"2026-05-18T01:18:29Z","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":"89866c98bfa88ed0e883954224d6b8d5f80d5c0599db3647ae6ae1613aff0eba","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-01-04T09:30:19Z","title_canon_sha256":"0794cef248dc4165acc73a26efac976e5dda7831c5fe1deca12bafcf077ca997"},"schema_version":"1.0","source":{"id":"1601.00420","kind":"arxiv","version":1}},"canonical_sha256":"7f797ead44760e5373a32e29cae1ab042ea499b94cf6b8db96f9e9a36d05d283","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7f797ead44760e5373a32e29cae1ab042ea499b94cf6b8db96f9e9a36d05d283","first_computed_at":"2026-05-18T01:18:29.796596Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:29.796596Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VMnQ8b56+hX4oML+8fQL2Y7EXZWnyBsoSeQS8EkGY3E086J9nL9zUIn1W3ciIVfRpzQsM8/ypjs1gVCDgRwhCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:29.797123Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.00420","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ef30031ae7b7ac3170e5523e8c8d262a01c7b515b314ea234890a425148ea30f","sha256:6fcc1a35bc07b9d6c85603c18bc7d67fde62e4fd35eeee66fe45ad3d00e59644"],"state_sha256":"1a6966bc832fbc5c6b6f39fce30c27c3f00113f06f5f544469c6121cb2f71dec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DsgFvAcGZn6PdUcSFTZXmBCzsVOx+y2XsZEq1B2iGXUsJZjoFE5aQsO1dzhCMhmNVFC9KN1WBCiSwcIahoAEBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T00:10:12.956918Z","bundle_sha256":"6f193ff60fee0385b2ee667a32b33cca11536b851be2ba9f3a2725309114b8ab"}}