{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:M73ITXLPCTOAWTDQJ67ALML3GD","short_pith_number":"pith:M73ITXLP","canonical_record":{"source":{"id":"1410.4551","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-10-16T19:58:15Z","cross_cats_sorted":[],"title_canon_sha256":"3fa9fd78df636bc1c619975fdad0b904c057d894e87547818172f70e5441e73c","abstract_canon_sha256":"4143e1060f0889eccdb72a4db2c591984db699fafad77a10be38a7d491dccf8b"},"schema_version":"1.0"},"canonical_sha256":"67f689dd6f14dc0b4c704fbe05b17b30e8aea7f4a0876fc2a3c16c5ac77aa053","source":{"kind":"arxiv","id":"1410.4551","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.4551","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"arxiv_version","alias_value":"1410.4551v2","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.4551","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"pith_short_12","alias_value":"M73ITXLPCTOA","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"M73ITXLPCTOAWTDQ","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"M73ITXLP","created_at":"2026-05-18T12:28:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:M73ITXLPCTOAWTDQJ67ALML3GD","target":"record","payload":{"canonical_record":{"source":{"id":"1410.4551","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-10-16T19:58:15Z","cross_cats_sorted":[],"title_canon_sha256":"3fa9fd78df636bc1c619975fdad0b904c057d894e87547818172f70e5441e73c","abstract_canon_sha256":"4143e1060f0889eccdb72a4db2c591984db699fafad77a10be38a7d491dccf8b"},"schema_version":"1.0"},"canonical_sha256":"67f689dd6f14dc0b4c704fbe05b17b30e8aea7f4a0876fc2a3c16c5ac77aa053","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:55:53.068456Z","signature_b64":"3mcKO0lfPC+S936xI9oVVlryTKpEbIe/L76DxUlEYFHNCHWXc0wOkOTKhWDE4CjfBxiiWFOSSlBziCI+ojgOBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"67f689dd6f14dc0b4c704fbe05b17b30e8aea7f4a0876fc2a3c16c5ac77aa053","last_reissued_at":"2026-05-18T01:55:53.067849Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:55:53.067849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1410.4551","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":"2026-05-18T01:55:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xvZ3BqPLj9K9WuTKh0DZBYC6geDqGn6Z0nlqhjJthc8g0ScVmt8WZ3vXr4GAPV1W1M3VA4+OANtypavRWuuJCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T19:55:37.435700Z"},"content_sha256":"24d7b11a4d73e05a8626c696f73761364a627869cda5ab9f5ca578e01192839c","schema_version":"1.0","event_id":"sha256:24d7b11a4d73e05a8626c696f73761364a627869cda5ab9f5ca578e01192839c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:M73ITXLPCTOAWTDQJ67ALML3GD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ab initio study of the relationship between spontaneous polarization and p-type doping in quasi-freestanding graphene on H-passivated SiC surfaces","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"H. Aramberri, J. I. Cerd\\'a, J. Slawinska, M.C. Mu\\~noz","submitted_at":"2014-10-16T19:58:15Z","abstract_excerpt":"Quasi-free standing graphene (QFG) obtained by the intercalation of a hydrogen layer between a SiC surface and the graphene is recognized as an excellent candidate for the development of graphene based technology. In addition, the recent proposal of a direct equivalence between the $p$-type doping typically found for these systems and the spontaneous polarization (SP) associated to the particular SiC polytype, opens the possibility of tuning the number of carriers in the Dirac cones without the need of external gate voltages. However, first principles calculations which could confirm at the at"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.4551","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":"2026-05-18T01:55:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AadCsZV2xHQnctEixDQpHtdzMlP8tf33SWWUYegP03Noy2Ha+smmBY13SUU3nEnyZnrmxdkhiFnObYHRfnLIDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T19:55:37.436041Z"},"content_sha256":"cda2d25360fa67374f6b407c45f4b24507d0248d439dc33c66c1ee82bb9f9525","schema_version":"1.0","event_id":"sha256:cda2d25360fa67374f6b407c45f4b24507d0248d439dc33c66c1ee82bb9f9525"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/M73ITXLPCTOAWTDQJ67ALML3GD/bundle.json","state_url":"https://pith.science/pith/M73ITXLPCTOAWTDQJ67ALML3GD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/M73ITXLPCTOAWTDQJ67ALML3GD/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":"2026-06-27T19:55:37Z","links":{"resolver":"https://pith.science/pith/M73ITXLPCTOAWTDQJ67ALML3GD","bundle":"https://pith.science/pith/M73ITXLPCTOAWTDQJ67ALML3GD/bundle.json","state":"https://pith.science/pith/M73ITXLPCTOAWTDQJ67ALML3GD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/M73ITXLPCTOAWTDQJ67ALML3GD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:M73ITXLPCTOAWTDQJ67ALML3GD","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":"4143e1060f0889eccdb72a4db2c591984db699fafad77a10be38a7d491dccf8b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-10-16T19:58:15Z","title_canon_sha256":"3fa9fd78df636bc1c619975fdad0b904c057d894e87547818172f70e5441e73c"},"schema_version":"1.0","source":{"id":"1410.4551","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.4551","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"arxiv_version","alias_value":"1410.4551v2","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.4551","created_at":"2026-05-18T01:55:53Z"},{"alias_kind":"pith_short_12","alias_value":"M73ITXLPCTOA","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_16","alias_value":"M73ITXLPCTOAWTDQ","created_at":"2026-05-18T12:28:38Z"},{"alias_kind":"pith_short_8","alias_value":"M73ITXLP","created_at":"2026-05-18T12:28:38Z"}],"graph_snapshots":[{"event_id":"sha256:cda2d25360fa67374f6b407c45f4b24507d0248d439dc33c66c1ee82bb9f9525","target":"graph","created_at":"2026-05-18T01:55:53Z","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":"Quasi-free standing graphene (QFG) obtained by the intercalation of a hydrogen layer between a SiC surface and the graphene is recognized as an excellent candidate for the development of graphene based technology. In addition, the recent proposal of a direct equivalence between the $p$-type doping typically found for these systems and the spontaneous polarization (SP) associated to the particular SiC polytype, opens the possibility of tuning the number of carriers in the Dirac cones without the need of external gate voltages. However, first principles calculations which could confirm at the at","authors_text":"H. Aramberri, J. I. Cerd\\'a, J. Slawinska, M.C. Mu\\~noz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-10-16T19:58:15Z","title":"Ab initio study of the relationship between spontaneous polarization and p-type doping in quasi-freestanding graphene on H-passivated SiC surfaces"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.4551","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":"sha256:24d7b11a4d73e05a8626c696f73761364a627869cda5ab9f5ca578e01192839c","target":"record","created_at":"2026-05-18T01:55:53Z","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":"4143e1060f0889eccdb72a4db2c591984db699fafad77a10be38a7d491dccf8b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-10-16T19:58:15Z","title_canon_sha256":"3fa9fd78df636bc1c619975fdad0b904c057d894e87547818172f70e5441e73c"},"schema_version":"1.0","source":{"id":"1410.4551","kind":"arxiv","version":2}},"canonical_sha256":"67f689dd6f14dc0b4c704fbe05b17b30e8aea7f4a0876fc2a3c16c5ac77aa053","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"67f689dd6f14dc0b4c704fbe05b17b30e8aea7f4a0876fc2a3c16c5ac77aa053","first_computed_at":"2026-05-18T01:55:53.067849Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:55:53.067849Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3mcKO0lfPC+S936xI9oVVlryTKpEbIe/L76DxUlEYFHNCHWXc0wOkOTKhWDE4CjfBxiiWFOSSlBziCI+ojgOBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:55:53.068456Z","signed_message":"canonical_sha256_bytes"},"source_id":"1410.4551","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:24d7b11a4d73e05a8626c696f73761364a627869cda5ab9f5ca578e01192839c","sha256:cda2d25360fa67374f6b407c45f4b24507d0248d439dc33c66c1ee82bb9f9525"],"state_sha256":"b065583e5df15a796c916f55b1ec2912a2196362f3e1ba1c6d7868536ca80790"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YjJ5c8+8NJddLl87SohOdQ7YilOvh43cjMaU9tMsLggHUPbONnUEovFreQp/QLyVketAGPsxb9gBelhN7x2vBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T19:55:37.437994Z","bundle_sha256":"4a99ecf6e179d25e793db5ec0097bdd136339396be06fa1757c94511086897d6"}}