{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:CY4NGZSHZO4VXRDK6EEY6P3UNX","short_pith_number":"pith:CY4NGZSH","canonical_record":{"source":{"id":"1202.1753","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-02-08T16:22:35Z","cross_cats_sorted":[],"title_canon_sha256":"7962150977e421a204264e763283996c43c1974e14f09c0cd7d3d8764210cf34","abstract_canon_sha256":"eb28f78fb6e6b55158fed9bcce5601738782ad0ee2c8d9958f3e04317b4e7e70"},"schema_version":"1.0"},"canonical_sha256":"1638d36647cbb95bc46af1098f3f746dc791ee5f29cefef355b0d7707013a04f","source":{"kind":"arxiv","id":"1202.1753","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.1753","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.1753v2","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.1753","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"pith_short_12","alias_value":"CY4NGZSHZO4V","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"CY4NGZSHZO4VXRDK","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"CY4NGZSH","created_at":"2026-05-18T12:27:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:CY4NGZSHZO4VXRDK6EEY6P3UNX","target":"record","payload":{"canonical_record":{"source":{"id":"1202.1753","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-02-08T16:22:35Z","cross_cats_sorted":[],"title_canon_sha256":"7962150977e421a204264e763283996c43c1974e14f09c0cd7d3d8764210cf34","abstract_canon_sha256":"eb28f78fb6e6b55158fed9bcce5601738782ad0ee2c8d9958f3e04317b4e7e70"},"schema_version":"1.0"},"canonical_sha256":"1638d36647cbb95bc46af1098f3f746dc791ee5f29cefef355b0d7707013a04f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:57:24.445739Z","signature_b64":"bxdZGODd5Rek8FYlf3qiO5j0RFGKFz/egu0B2UDHLbT1NEKhNOS37HA3aiQmbTYNcxqvqyGhQMqXXOQdaBODDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1638d36647cbb95bc46af1098f3f746dc791ee5f29cefef355b0d7707013a04f","last_reissued_at":"2026-05-18T03:57:24.445118Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:57:24.445118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.1753","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":"2026-05-18T03:57:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z+7yKq47oHJ6HUP2JDzVEJx9ZZphJtaKlBBBIqOkiAihLDm+DIEoWgGiijOCjoEhHqDcxUr5m6z/Wgj9ZJlsAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:31:13.263306Z"},"content_sha256":"57ed80fc350e826f2862691274dbfcc21b32b99fb02c92cb70e694e21ad637a9","schema_version":"1.0","event_id":"sha256:57ed80fc350e826f2862691274dbfcc21b32b99fb02c92cb70e694e21ad637a9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:CY4NGZSHZO4VXRDK6EEY6P3UNX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Transport Gap in Suspended Bilayer Graphene at Zero Magnetic Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"A. Veligura, B. J. van Wees, H. J. van Elferen, J. C. Maan, N. Tombros, U. Zeitler","submitted_at":"2012-02-08T16:22:35Z","abstract_excerpt":"We report a change of three orders of magnitudes in the resistance of a suspended bilayer graphene flake which varies from a few k$\\Omega$s in the high carrier density regime to several M$\\Omega$s around the charge neutrality point (CNP). The corresponding transport gap is 8 meV at 0.3 K. The sequence of appearing quantum Hall plateaus at filling factor $\\nu=2$ followed by $\\nu=1$ suggests that the observed gap is caused by the symmetry breaking of the lowest Landau level. Investigation of the gap in a tilted magnetic field indicates that the resistance at the CNP shows a weak linear decrease "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.1753","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":"2026-05-18T03:57:24Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DMln6P213JdVRS9RtVCY03J0VMD78uhxXEPOAJNMxjCpPoYw5W/BmtPUk+GK6B61lNXgddsnK4VgsmqHMrX5DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T04:31:13.263680Z"},"content_sha256":"ec0eeb183dae926c5a5e55cb84c862c6832194bfc33dc8c1bc4d44fa22c1ff30","schema_version":"1.0","event_id":"sha256:ec0eeb183dae926c5a5e55cb84c862c6832194bfc33dc8c1bc4d44fa22c1ff30"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/bundle.json","state_url":"https://pith.science/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/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":"2026-06-03T04:31:13Z","links":{"resolver":"https://pith.science/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX","bundle":"https://pith.science/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/bundle.json","state":"https://pith.science/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CY4NGZSHZO4VXRDK6EEY6P3UNX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:CY4NGZSHZO4VXRDK6EEY6P3UNX","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":"eb28f78fb6e6b55158fed9bcce5601738782ad0ee2c8d9958f3e04317b4e7e70","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-02-08T16:22:35Z","title_canon_sha256":"7962150977e421a204264e763283996c43c1974e14f09c0cd7d3d8764210cf34"},"schema_version":"1.0","source":{"id":"1202.1753","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.1753","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"arxiv_version","alias_value":"1202.1753v2","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.1753","created_at":"2026-05-18T03:57:24Z"},{"alias_kind":"pith_short_12","alias_value":"CY4NGZSHZO4V","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"CY4NGZSHZO4VXRDK","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"CY4NGZSH","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:ec0eeb183dae926c5a5e55cb84c862c6832194bfc33dc8c1bc4d44fa22c1ff30","target":"graph","created_at":"2026-05-18T03:57:24Z","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 a change of three orders of magnitudes in the resistance of a suspended bilayer graphene flake which varies from a few k$\\Omega$s in the high carrier density regime to several M$\\Omega$s around the charge neutrality point (CNP). The corresponding transport gap is 8 meV at 0.3 K. The sequence of appearing quantum Hall plateaus at filling factor $\\nu=2$ followed by $\\nu=1$ suggests that the observed gap is caused by the symmetry breaking of the lowest Landau level. Investigation of the gap in a tilted magnetic field indicates that the resistance at the CNP shows a weak linear decrease ","authors_text":"A. Veligura, B. J. van Wees, H. J. van Elferen, J. C. Maan, N. Tombros, U. Zeitler","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-02-08T16:22:35Z","title":"Transport Gap in Suspended Bilayer Graphene at Zero Magnetic Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.1753","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":"sha256:57ed80fc350e826f2862691274dbfcc21b32b99fb02c92cb70e694e21ad637a9","target":"record","created_at":"2026-05-18T03:57:24Z","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":"eb28f78fb6e6b55158fed9bcce5601738782ad0ee2c8d9958f3e04317b4e7e70","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-02-08T16:22:35Z","title_canon_sha256":"7962150977e421a204264e763283996c43c1974e14f09c0cd7d3d8764210cf34"},"schema_version":"1.0","source":{"id":"1202.1753","kind":"arxiv","version":2}},"canonical_sha256":"1638d36647cbb95bc46af1098f3f746dc791ee5f29cefef355b0d7707013a04f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1638d36647cbb95bc46af1098f3f746dc791ee5f29cefef355b0d7707013a04f","first_computed_at":"2026-05-18T03:57:24.445118Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:57:24.445118Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bxdZGODd5Rek8FYlf3qiO5j0RFGKFz/egu0B2UDHLbT1NEKhNOS37HA3aiQmbTYNcxqvqyGhQMqXXOQdaBODDA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:57:24.445739Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.1753","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:57ed80fc350e826f2862691274dbfcc21b32b99fb02c92cb70e694e21ad637a9","sha256:ec0eeb183dae926c5a5e55cb84c862c6832194bfc33dc8c1bc4d44fa22c1ff30"],"state_sha256":"8d49dc59bfe6de94e22e73f503a282da583f85cd4c60236cf5a5bb7a66605429"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ADsdPpn7PzRxJh2sWawCfao27C6lmPuhg20TMoK9cHDf4ZlZgZnkBYk6pJ6B3/IoRTNqaIO/K4K5yHTCc7ipCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T04:31:13.265637Z","bundle_sha256":"2a4c29a91e7ff51657f0f48cb9a1826463e12fed8c3d2b6876c9e950308e6fcb"}}