{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:EDYD52M4S4BYMTCNQSQI4QSAYD","short_pith_number":"pith:EDYD52M4","canonical_record":{"source":{"id":"1211.3517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-11-15T07:47:46Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"eb50714f7e97d80d51b13167f496caebc0e708003777461ece9b13fcb777cbd7","abstract_canon_sha256":"b7e38b3c9a95a04cf11f0f435c85e850cc6b019b0f8aea7ac2eead3a8a3202f8"},"schema_version":"1.0"},"canonical_sha256":"20f03ee99c9703864c4d84a08e4240c0e687a252c333cc2b591d97afd235f431","source":{"kind":"arxiv","id":"1211.3517","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.3517","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"1211.3517v2","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.3517","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"EDYD52M4S4BY","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EDYD52M4S4BYMTCN","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EDYD52M4","created_at":"2026-05-18T12:27:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:EDYD52M4S4BYMTCNQSQI4QSAYD","target":"record","payload":{"canonical_record":{"source":{"id":"1211.3517","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-11-15T07:47:46Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"eb50714f7e97d80d51b13167f496caebc0e708003777461ece9b13fcb777cbd7","abstract_canon_sha256":"b7e38b3c9a95a04cf11f0f435c85e850cc6b019b0f8aea7ac2eead3a8a3202f8"},"schema_version":"1.0"},"canonical_sha256":"20f03ee99c9703864c4d84a08e4240c0e687a252c333cc2b591d97afd235f431","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:27:42.701713Z","signature_b64":"ZGw3b0lyEBT2yMH0Bu4K7afIS0dgvqPZjy0ZVWOeB0WB1XN5pkAQ3KqLz+J4ZCYgQyDsWiI69vCQvx74tNPJAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"20f03ee99c9703864c4d84a08e4240c0e687a252c333cc2b591d97afd235f431","last_reissued_at":"2026-05-18T03:27:42.701115Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:27:42.701115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1211.3517","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":"2026-05-18T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yyaKrcZs9APusLlzdG/MVXwjFRnpT50iVDGSVr+Nd6AAYoZk9M0O5W1NwzsUPU8XT3ERQ5uO+q5uHMxMXoDcDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:40:25.142237Z"},"content_sha256":"7ba453d519a69bb709d13dea473181345e744e5649d72b612534dabb9e955c60","schema_version":"1.0","event_id":"sha256:7ba453d519a69bb709d13dea473181345e744e5649d72b612534dabb9e955c60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:EDYD52M4S4BYMTCNQSQI4QSAYD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Coexistence of van Hove Singularities and Superlattice Dirac Points in a Slightly Twisted Graphene Bilayer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"Lin He, Wen-Yu He, Zhao-Dong Chu","submitted_at":"2012-11-15T07:47:46Z","abstract_excerpt":"We consider the electronic structure of a slightly twisted graphene bilayer and show the coexistence of van Hove singularities (VHSs) and superlattice Dirac points in a continuum approximation. The graphene-on-graphene moir\\'e pattern gives rise to a periodic electronic potential, which leads to the emergence of the superlattice Dirac points due to the chiral nature of the charge carriers. Owning to the distinguishing real and reciprocal structures, the sublattice exchange even and odd structures of the twisted graphene bilayer (the two types of commensurate structures) result in two different"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.3517","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":"2026-05-18T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZFcSEWeBvUPzFliTZUxEjYZHtC7NQFlfNLBY2MKVP4qgz6PRQITMo686xTzEhfrZwS3Chz8YQUmdkFacpGtkAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:40:25.142926Z"},"content_sha256":"bdde88eb69b025c28b0af09d618fa4cd5a6370d4b0c117a1285fdc3bcc454bea","schema_version":"1.0","event_id":"sha256:bdde88eb69b025c28b0af09d618fa4cd5a6370d4b0c117a1285fdc3bcc454bea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/bundle.json","state_url":"https://pith.science/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/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":"2026-06-08T01:40:25Z","links":{"resolver":"https://pith.science/pith/EDYD52M4S4BYMTCNQSQI4QSAYD","bundle":"https://pith.science/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/bundle.json","state":"https://pith.science/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EDYD52M4S4BYMTCNQSQI4QSAYD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:EDYD52M4S4BYMTCNQSQI4QSAYD","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":"b7e38b3c9a95a04cf11f0f435c85e850cc6b019b0f8aea7ac2eead3a8a3202f8","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-11-15T07:47:46Z","title_canon_sha256":"eb50714f7e97d80d51b13167f496caebc0e708003777461ece9b13fcb777cbd7"},"schema_version":"1.0","source":{"id":"1211.3517","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1211.3517","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"1211.3517v2","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1211.3517","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"EDYD52M4S4BY","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_16","alias_value":"EDYD52M4S4BYMTCN","created_at":"2026-05-18T12:27:04Z"},{"alias_kind":"pith_short_8","alias_value":"EDYD52M4","created_at":"2026-05-18T12:27:04Z"}],"graph_snapshots":[{"event_id":"sha256:bdde88eb69b025c28b0af09d618fa4cd5a6370d4b0c117a1285fdc3bcc454bea","target":"graph","created_at":"2026-05-18T03:27:42Z","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 consider the electronic structure of a slightly twisted graphene bilayer and show the coexistence of van Hove singularities (VHSs) and superlattice Dirac points in a continuum approximation. The graphene-on-graphene moir\\'e pattern gives rise to a periodic electronic potential, which leads to the emergence of the superlattice Dirac points due to the chiral nature of the charge carriers. Owning to the distinguishing real and reciprocal structures, the sublattice exchange even and odd structures of the twisted graphene bilayer (the two types of commensurate structures) result in two different","authors_text":"Lin He, Wen-Yu He, Zhao-Dong Chu","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-11-15T07:47:46Z","title":"The Coexistence of van Hove Singularities and Superlattice Dirac Points in a Slightly Twisted Graphene Bilayer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.3517","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":"sha256:7ba453d519a69bb709d13dea473181345e744e5649d72b612534dabb9e955c60","target":"record","created_at":"2026-05-18T03:27:42Z","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":"b7e38b3c9a95a04cf11f0f435c85e850cc6b019b0f8aea7ac2eead3a8a3202f8","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-11-15T07:47:46Z","title_canon_sha256":"eb50714f7e97d80d51b13167f496caebc0e708003777461ece9b13fcb777cbd7"},"schema_version":"1.0","source":{"id":"1211.3517","kind":"arxiv","version":2}},"canonical_sha256":"20f03ee99c9703864c4d84a08e4240c0e687a252c333cc2b591d97afd235f431","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"20f03ee99c9703864c4d84a08e4240c0e687a252c333cc2b591d97afd235f431","first_computed_at":"2026-05-18T03:27:42.701115Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:27:42.701115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZGw3b0lyEBT2yMH0Bu4K7afIS0dgvqPZjy0ZVWOeB0WB1XN5pkAQ3KqLz+J4ZCYgQyDsWiI69vCQvx74tNPJAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:27:42.701713Z","signed_message":"canonical_sha256_bytes"},"source_id":"1211.3517","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7ba453d519a69bb709d13dea473181345e744e5649d72b612534dabb9e955c60","sha256:bdde88eb69b025c28b0af09d618fa4cd5a6370d4b0c117a1285fdc3bcc454bea"],"state_sha256":"86236ce3ac71e6889e80dba645e7de91400f39f63887ad4d53477a0c3a94090a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SSTsspd8KTJzicqAG2fgfNd6D6/GopMNmimkDB5hGQ6voNfYsmF/PUyuT+kwMv5gYj82othzJ6mGfyh1xedjCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T01:40:25.146513Z","bundle_sha256":"43bd11adabab96d7739814e51f3a9cb53306c7fe2191dcbef0d9d64806153f5e"}}