{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:NEI27TVBKYZ5BH3NOFF3WLJXDZ","short_pith_number":"pith:NEI27TVB","canonical_record":{"source":{"id":"1309.5496","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-09-21T16:36:38Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"f1364b1725d47a1b1822e3170160485c1c50fcd5929deba90c2bd5876fa5b6c8","abstract_canon_sha256":"cb2c1a113ec5ce5124826abb4d6301435b616885f65fc7d53224188123e2d625"},"schema_version":"1.0"},"canonical_sha256":"6911afcea15633d09f6d714bbb2d371e42b115de008cba1f7faa2210f322395e","source":{"kind":"arxiv","id":"1309.5496","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.5496","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"arxiv_version","alias_value":"1309.5496v1","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.5496","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"pith_short_12","alias_value":"NEI27TVBKYZ5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NEI27TVBKYZ5BH3N","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NEI27TVB","created_at":"2026-05-18T12:27:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:NEI27TVBKYZ5BH3NOFF3WLJXDZ","target":"record","payload":{"canonical_record":{"source":{"id":"1309.5496","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-09-21T16:36:38Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"f1364b1725d47a1b1822e3170160485c1c50fcd5929deba90c2bd5876fa5b6c8","abstract_canon_sha256":"cb2c1a113ec5ce5124826abb4d6301435b616885f65fc7d53224188123e2d625"},"schema_version":"1.0"},"canonical_sha256":"6911afcea15633d09f6d714bbb2d371e42b115de008cba1f7faa2210f322395e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:19:48.125126Z","signature_b64":"WWcPVNfFrrLCH+voEEU3gNUMqrLVBeQbkz5npAkyeDcs+CPLUISrEYs8b3xUB7Rv1Fogo4anqMG4oMdiWoF+DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6911afcea15633d09f6d714bbb2d371e42b115de008cba1f7faa2210f322395e","last_reissued_at":"2026-05-18T00:19:48.124396Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:19:48.124396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.5496","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":"2026-05-18T00:19:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bgXGjWekjBXkJ/3uC3iRybG5ZZc2/Sy57zUPuBZ8Pdcs72kUZCNwCmHZk3Hk4blV78Xw5ETUKHymvX+1t1fKBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T15:44:10.789152Z"},"content_sha256":"85105990ef398b8561664dff80aeb42cf27dd2cb75e5fda46e629f72c36a33e7","schema_version":"1.0","event_id":"sha256:85105990ef398b8561664dff80aeb42cf27dd2cb75e5fda46e629f72c36a33e7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:NEI27TVBKYZ5BH3NOFF3WLJXDZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Anomalously Strong 2D Band Intensity in Twisted Bilayer Graphene: Raman Evidence for Doubly Degenerate Dirac Band","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"cond-mat.mes-hall","authors_text":"Francisco Robles-Hernandez, Haiyan Wang, Jiming Bao, Kevin McCarty, Shin-Shem Pei, Shu Nie, Viktor G. Hadjiev, Wei Wu, Xinghua Lu, Yanan Wang, Zhihua Su","submitted_at":"2013-09-21T16:36:38Z","abstract_excerpt":"We report the observation of anomalously strong 2D band in twisted bilayer graphene (tBLG) with large rotation angles under 638-nm and 532-nm visible laser excitation. The 2D band of tBLG can reach four times as opposed to two times as strong as that of single layer graphene. The same tBLG samples also exhibit rotation dependent G-line resonances and folded phonons under 364-nm UV laser excitation. We attribute this 2D band Raman enhancement to the constructive quantum interference between two double-resonance Raman pathways which are enabled by nearly degenerate Dirac band in tBLG Moir\\'e sup"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.5496","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":"2026-05-18T00:19:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wya5yyz6zUmxOtULQUMwnDzdqnIWxw5eV85p9ewd7eM9ehO1gTN0+WBYG2f1gcPIdOFrj2z/gds4bzSwgsfiBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T15:44:10.789885Z"},"content_sha256":"b107e3e87a8d8365e5480d59793fa75d422cc33abd8771248c0fd38fc7daa1ed","schema_version":"1.0","event_id":"sha256:b107e3e87a8d8365e5480d59793fa75d422cc33abd8771248c0fd38fc7daa1ed"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/bundle.json","state_url":"https://pith.science/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/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":"2026-05-30T15:44:10Z","links":{"resolver":"https://pith.science/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ","bundle":"https://pith.science/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/bundle.json","state":"https://pith.science/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NEI27TVBKYZ5BH3NOFF3WLJXDZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:NEI27TVBKYZ5BH3NOFF3WLJXDZ","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":"cb2c1a113ec5ce5124826abb4d6301435b616885f65fc7d53224188123e2d625","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-09-21T16:36:38Z","title_canon_sha256":"f1364b1725d47a1b1822e3170160485c1c50fcd5929deba90c2bd5876fa5b6c8"},"schema_version":"1.0","source":{"id":"1309.5496","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.5496","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"arxiv_version","alias_value":"1309.5496v1","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.5496","created_at":"2026-05-18T00:19:48Z"},{"alias_kind":"pith_short_12","alias_value":"NEI27TVBKYZ5","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_16","alias_value":"NEI27TVBKYZ5BH3N","created_at":"2026-05-18T12:27:52Z"},{"alias_kind":"pith_short_8","alias_value":"NEI27TVB","created_at":"2026-05-18T12:27:52Z"}],"graph_snapshots":[{"event_id":"sha256:b107e3e87a8d8365e5480d59793fa75d422cc33abd8771248c0fd38fc7daa1ed","target":"graph","created_at":"2026-05-18T00:19:48Z","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 the observation of anomalously strong 2D band in twisted bilayer graphene (tBLG) with large rotation angles under 638-nm and 532-nm visible laser excitation. The 2D band of tBLG can reach four times as opposed to two times as strong as that of single layer graphene. The same tBLG samples also exhibit rotation dependent G-line resonances and folded phonons under 364-nm UV laser excitation. We attribute this 2D band Raman enhancement to the constructive quantum interference between two double-resonance Raman pathways which are enabled by nearly degenerate Dirac band in tBLG Moir\\'e sup","authors_text":"Francisco Robles-Hernandez, Haiyan Wang, Jiming Bao, Kevin McCarty, Shin-Shem Pei, Shu Nie, Viktor G. Hadjiev, Wei Wu, Xinghua Lu, Yanan Wang, Zhihua Su","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-09-21T16:36:38Z","title":"Anomalously Strong 2D Band Intensity in Twisted Bilayer Graphene: Raman Evidence for Doubly Degenerate Dirac Band"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.5496","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":"sha256:85105990ef398b8561664dff80aeb42cf27dd2cb75e5fda46e629f72c36a33e7","target":"record","created_at":"2026-05-18T00:19:48Z","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":"cb2c1a113ec5ce5124826abb4d6301435b616885f65fc7d53224188123e2d625","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-09-21T16:36:38Z","title_canon_sha256":"f1364b1725d47a1b1822e3170160485c1c50fcd5929deba90c2bd5876fa5b6c8"},"schema_version":"1.0","source":{"id":"1309.5496","kind":"arxiv","version":1}},"canonical_sha256":"6911afcea15633d09f6d714bbb2d371e42b115de008cba1f7faa2210f322395e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6911afcea15633d09f6d714bbb2d371e42b115de008cba1f7faa2210f322395e","first_computed_at":"2026-05-18T00:19:48.124396Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:19:48.124396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WWcPVNfFrrLCH+voEEU3gNUMqrLVBeQbkz5npAkyeDcs+CPLUISrEYs8b3xUB7Rv1Fogo4anqMG4oMdiWoF+DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:19:48.125126Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.5496","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:85105990ef398b8561664dff80aeb42cf27dd2cb75e5fda46e629f72c36a33e7","sha256:b107e3e87a8d8365e5480d59793fa75d422cc33abd8771248c0fd38fc7daa1ed"],"state_sha256":"3d50119e5820475313b72dd29475617e718c5ee9c715cd39c9435ef85e9a6349"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nvp75pe5UovnZiXNE+0u6aViqq8dTs98IVWV6cLZmQTeiBjFlmw/EV68/cJCuTMB0xKYFbFgsgBwWGpp4gnFAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T15:44:10.793600Z","bundle_sha256":"3734057a96fb932e1871ff368e519dc2d72e07eccb5971ba9a19d3734c5b8a5d"}}