{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:WX76XWC67Q3AUPKLIWOIU53QXK","short_pith_number":"pith:WX76XWC6","canonical_record":{"source":{"id":"1108.2476","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-08-11T17:47:59Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"9d477ac8d93ab7c2a714f7ea011a00f1b8a56e837f7270af572789a789731c99","abstract_canon_sha256":"efc3d9255f4bb847f17bfd9e29f180580d23a45455a3d767c15865c7ba5cb006"},"schema_version":"1.0"},"canonical_sha256":"b5ffebd85efc360a3d4b459c8a7770ba8e7382d0c97c13ad602fe4a745fec057","source":{"kind":"arxiv","id":"1108.2476","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.2476","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"arxiv_version","alias_value":"1108.2476v2","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.2476","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"pith_short_12","alias_value":"WX76XWC67Q3A","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WX76XWC67Q3AUPKL","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WX76XWC6","created_at":"2026-05-18T12:26:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:WX76XWC67Q3AUPKLIWOIU53QXK","target":"record","payload":{"canonical_record":{"source":{"id":"1108.2476","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-08-11T17:47:59Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"9d477ac8d93ab7c2a714f7ea011a00f1b8a56e837f7270af572789a789731c99","abstract_canon_sha256":"efc3d9255f4bb847f17bfd9e29f180580d23a45455a3d767c15865c7ba5cb006"},"schema_version":"1.0"},"canonical_sha256":"b5ffebd85efc360a3d4b459c8a7770ba8e7382d0c97c13ad602fe4a745fec057","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:55:37.432044Z","signature_b64":"gFoKQPEDgikslRXsb+IQSST3n3mcE2oP0EdhKtgCFWPsiOlWhLj44GxG1hJSQlZz4MXWGmQ7JOIUt/a4Y/ktBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b5ffebd85efc360a3d4b459c8a7770ba8e7382d0c97c13ad602fe4a745fec057","last_reissued_at":"2026-05-18T03:55:37.431362Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:55:37.431362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.2476","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:55:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g6eBLuz2qEgfyzqgPKkObQcV3uU9vPBm6NEuSw5/0zY6qnbhUiJdi2MDydvWrtphCRNej4iRxjC6LZ0BBvqGDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T10:48:42.650026Z"},"content_sha256":"f4ab33a89a3d97f758a9f63fc7e4c9b2ff4848d6a12d40fa51afad843e27a818","schema_version":"1.0","event_id":"sha256:f4ab33a89a3d97f758a9f63fc7e4c9b2ff4848d6a12d40fa51afad843e27a818"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:WX76XWC67Q3AUPKLIWOIU53QXK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Magnetotransport Properties of Quasi-Free Standing Epitaxial Graphene Bilayer on SiC: Evidence for Bernal Stacking","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"E. Tutuc, Kayoung Lee, M. S. Points, Seyoung Kim, Taisuke Ohta, T. E. Beechem","submitted_at":"2011-08-11T17:47:59Z","abstract_excerpt":"We investigate the magnetotransport properties of quasi-free standing epitaxial graphene bilayer on SiC, grown by atmospheric pressure graphitization in Ar, followed by H$_2$ intercalation. At the charge neutrality point the longitudinal resistance shows an insulating behavior, which follows a temperature dependence consistent with variable range hopping transport in a gapped state. In a perpendicular magnetic field, we observe quantum Hall states (QHSs) both at filling factors ($\\nu$) multiple of four ($\\nu=4, 8, 12$), as well as broken valley symmetry QHSs at $\\nu=0$ and $\\nu=6$. These resul"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.2476","kind":"arxiv","version":2},"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":"2026-05-18T03:55:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rKjwK4CYRl9PLPcZ7x6V/iKA8ik75YC1j1kmaZs9nhb+D4UsZe8W2yE4dmWDMHaIG7Mo/lF1dJSGK9Hzp0bVDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T10:48:42.650388Z"},"content_sha256":"36ea103d6f7304c36a215a26cf75f592f41df448b04a35b9a89d5028f83a1ce0","schema_version":"1.0","event_id":"sha256:36ea103d6f7304c36a215a26cf75f592f41df448b04a35b9a89d5028f83a1ce0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WX76XWC67Q3AUPKLIWOIU53QXK/bundle.json","state_url":"https://pith.science/pith/WX76XWC67Q3AUPKLIWOIU53QXK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WX76XWC67Q3AUPKLIWOIU53QXK/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":"2026-06-26T10:48:42Z","links":{"resolver":"https://pith.science/pith/WX76XWC67Q3AUPKLIWOIU53QXK","bundle":"https://pith.science/pith/WX76XWC67Q3AUPKLIWOIU53QXK/bundle.json","state":"https://pith.science/pith/WX76XWC67Q3AUPKLIWOIU53QXK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WX76XWC67Q3AUPKLIWOIU53QXK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:WX76XWC67Q3AUPKLIWOIU53QXK","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":"efc3d9255f4bb847f17bfd9e29f180580d23a45455a3d767c15865c7ba5cb006","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-08-11T17:47:59Z","title_canon_sha256":"9d477ac8d93ab7c2a714f7ea011a00f1b8a56e837f7270af572789a789731c99"},"schema_version":"1.0","source":{"id":"1108.2476","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.2476","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"arxiv_version","alias_value":"1108.2476v2","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.2476","created_at":"2026-05-18T03:55:37Z"},{"alias_kind":"pith_short_12","alias_value":"WX76XWC67Q3A","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_16","alias_value":"WX76XWC67Q3AUPKL","created_at":"2026-05-18T12:26:44Z"},{"alias_kind":"pith_short_8","alias_value":"WX76XWC6","created_at":"2026-05-18T12:26:44Z"}],"graph_snapshots":[{"event_id":"sha256:36ea103d6f7304c36a215a26cf75f592f41df448b04a35b9a89d5028f83a1ce0","target":"graph","created_at":"2026-05-18T03:55:37Z","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 investigate the magnetotransport properties of quasi-free standing epitaxial graphene bilayer on SiC, grown by atmospheric pressure graphitization in Ar, followed by H$_2$ intercalation. At the charge neutrality point the longitudinal resistance shows an insulating behavior, which follows a temperature dependence consistent with variable range hopping transport in a gapped state. In a perpendicular magnetic field, we observe quantum Hall states (QHSs) both at filling factors ($\\nu$) multiple of four ($\\nu=4, 8, 12$), as well as broken valley symmetry QHSs at $\\nu=0$ and $\\nu=6$. These resul","authors_text":"E. Tutuc, Kayoung Lee, M. S. Points, Seyoung Kim, Taisuke Ohta, T. E. Beechem","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-08-11T17:47:59Z","title":"Magnetotransport Properties of Quasi-Free Standing Epitaxial Graphene Bilayer on SiC: Evidence for Bernal Stacking"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.2476","kind":"arxiv","version":2},"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:f4ab33a89a3d97f758a9f63fc7e4c9b2ff4848d6a12d40fa51afad843e27a818","target":"record","created_at":"2026-05-18T03:55:37Z","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":"efc3d9255f4bb847f17bfd9e29f180580d23a45455a3d767c15865c7ba5cb006","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2011-08-11T17:47:59Z","title_canon_sha256":"9d477ac8d93ab7c2a714f7ea011a00f1b8a56e837f7270af572789a789731c99"},"schema_version":"1.0","source":{"id":"1108.2476","kind":"arxiv","version":2}},"canonical_sha256":"b5ffebd85efc360a3d4b459c8a7770ba8e7382d0c97c13ad602fe4a745fec057","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b5ffebd85efc360a3d4b459c8a7770ba8e7382d0c97c13ad602fe4a745fec057","first_computed_at":"2026-05-18T03:55:37.431362Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:55:37.431362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gFoKQPEDgikslRXsb+IQSST3n3mcE2oP0EdhKtgCFWPsiOlWhLj44GxG1hJSQlZz4MXWGmQ7JOIUt/a4Y/ktBg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:55:37.432044Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.2476","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f4ab33a89a3d97f758a9f63fc7e4c9b2ff4848d6a12d40fa51afad843e27a818","sha256:36ea103d6f7304c36a215a26cf75f592f41df448b04a35b9a89d5028f83a1ce0"],"state_sha256":"168635a4523f424678c1a34e2cb24eb5d14fa5f175bdcb05833568ed543d648d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6NfObrrHsywBJ9nJUjD6EcKHcDyjHw178/udaIGqN1cVz7HrijvoUtw8BfdfmiD0pZ8UYdBjYNX4jQL6uvFxDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T10:48:42.652312Z","bundle_sha256":"cc9d02cc81d3467a8f725664dac55d5069a1dbfd514a55ad3821cb5993f73ed3"}}