{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:TPH34C3QSZCIYU3W6N2JZKII66","short_pith_number":"pith:TPH34C3Q","canonical_record":{"source":{"id":"1406.5571","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-21T02:44:22Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"917808d3220a422869aec14cfa41912799925b7faec6eeac66107327c378a8ce","abstract_canon_sha256":"c328fc4a40c852540fbf5412743e410a0c7ca8548f0a46a9e32b32c40b31b6ac"},"schema_version":"1.0"},"canonical_sha256":"9bcfbe0b7096448c5376f3749ca908f796255b440b97e187738af03d374c95a5","source":{"kind":"arxiv","id":"1406.5571","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.5571","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"arxiv_version","alias_value":"1406.5571v1","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.5571","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"pith_short_12","alias_value":"TPH34C3QSZCI","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"TPH34C3QSZCIYU3W","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"TPH34C3Q","created_at":"2026-05-18T12:28:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:TPH34C3QSZCIYU3W6N2JZKII66","target":"record","payload":{"canonical_record":{"source":{"id":"1406.5571","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-21T02:44:22Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"917808d3220a422869aec14cfa41912799925b7faec6eeac66107327c378a8ce","abstract_canon_sha256":"c328fc4a40c852540fbf5412743e410a0c7ca8548f0a46a9e32b32c40b31b6ac"},"schema_version":"1.0"},"canonical_sha256":"9bcfbe0b7096448c5376f3749ca908f796255b440b97e187738af03d374c95a5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:47:15.181601Z","signature_b64":"B77SVnDHvTP00PSPrbJy5UxrrCIp4jxT5RIRQcSCgH8+BXdqMmEhnkHsSKqsvlrL7cdB05zq+3i/BTJ9G5x6Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9bcfbe0b7096448c5376f3749ca908f796255b440b97e187738af03d374c95a5","last_reissued_at":"2026-05-18T02:47:15.181141Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:47:15.181141Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1406.5571","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":"2026-05-18T02:47:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V/blnba8S4qZZuLYyQsuBu0hMCqbl1G/UPYqRvZeSUreuq6osXrt9S6gqfAeRWQejLOfNIRKaDoLpPotoJBuBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T08:45:43.087523Z"},"content_sha256":"3de97a0945b0245c400eb4e4db724c82b6d415bab321349be48a5889ac8feef5","schema_version":"1.0","event_id":"sha256:3de97a0945b0245c400eb4e4db724c82b6d415bab321349be48a5889ac8feef5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:TPH34C3QSZCIYU3W6N2JZKII66","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"Feng Wang, Guangyu Zhang, Hugen Yan, Wei Yang, Xiaobo Lu, You Lai, Zhi-Guo Chen, Zhiqiang Li, Zhiwen Shi","submitted_at":"2014-06-21T02:44:22Z","abstract_excerpt":"Van der Waals heterostructures formed by assembling different two-dimensional atomic crystals into stacks can lead to many new phenomena and device functionalities. In particular, graphene/boron-nitride heterostructures have emerged as a very promising system for band engineering of graphene. However, the intrinsic value and origin of the bandgap in such heterostructures remain unresolved. Here we report the observation of an intrinsic bandgap in epitaxial graphene/boron-nitride heterostructures with zero crystallographic alignment angle. Magneto-optical spectroscopy provides a direct probe of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.5571","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":"2026-05-18T02:47:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FUBEMenLdQwWv7Pb8/1FWZN54WNOVpmQ//m2gSFGHMyQPRXV308sk7LUIk/sUF01apJ96NyWAs2f+kLuUlArDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-20T08:45:43.087875Z"},"content_sha256":"5abb8b63505981caf0c17d8ae8c0361771e3a40c5a499947bbfaf2f27427492e","schema_version":"1.0","event_id":"sha256:5abb8b63505981caf0c17d8ae8c0361771e3a40c5a499947bbfaf2f27427492e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TPH34C3QSZCIYU3W6N2JZKII66/bundle.json","state_url":"https://pith.science/pith/TPH34C3QSZCIYU3W6N2JZKII66/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TPH34C3QSZCIYU3W6N2JZKII66/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":"2026-05-20T08:45:43Z","links":{"resolver":"https://pith.science/pith/TPH34C3QSZCIYU3W6N2JZKII66","bundle":"https://pith.science/pith/TPH34C3QSZCIYU3W6N2JZKII66/bundle.json","state":"https://pith.science/pith/TPH34C3QSZCIYU3W6N2JZKII66/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TPH34C3QSZCIYU3W6N2JZKII66/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:TPH34C3QSZCIYU3W6N2JZKII66","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":"c328fc4a40c852540fbf5412743e410a0c7ca8548f0a46a9e32b32c40b31b6ac","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-21T02:44:22Z","title_canon_sha256":"917808d3220a422869aec14cfa41912799925b7faec6eeac66107327c378a8ce"},"schema_version":"1.0","source":{"id":"1406.5571","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.5571","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"arxiv_version","alias_value":"1406.5571v1","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.5571","created_at":"2026-05-18T02:47:15Z"},{"alias_kind":"pith_short_12","alias_value":"TPH34C3QSZCI","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"TPH34C3QSZCIYU3W","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"TPH34C3Q","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:5abb8b63505981caf0c17d8ae8c0361771e3a40c5a499947bbfaf2f27427492e","target":"graph","created_at":"2026-05-18T02:47:15Z","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":"Van der Waals heterostructures formed by assembling different two-dimensional atomic crystals into stacks can lead to many new phenomena and device functionalities. In particular, graphene/boron-nitride heterostructures have emerged as a very promising system for band engineering of graphene. However, the intrinsic value and origin of the bandgap in such heterostructures remain unresolved. Here we report the observation of an intrinsic bandgap in epitaxial graphene/boron-nitride heterostructures with zero crystallographic alignment angle. Magneto-optical spectroscopy provides a direct probe of","authors_text":"Feng Wang, Guangyu Zhang, Hugen Yan, Wei Yang, Xiaobo Lu, You Lai, Zhi-Guo Chen, Zhiqiang Li, Zhiwen Shi","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-21T02:44:22Z","title":"Observation of an intrinsic bandgap and Landau level renormalization in graphene/boron-nitride heterostructures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.5571","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":"sha256:3de97a0945b0245c400eb4e4db724c82b6d415bab321349be48a5889ac8feef5","target":"record","created_at":"2026-05-18T02:47:15Z","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":"c328fc4a40c852540fbf5412743e410a0c7ca8548f0a46a9e32b32c40b31b6ac","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-06-21T02:44:22Z","title_canon_sha256":"917808d3220a422869aec14cfa41912799925b7faec6eeac66107327c378a8ce"},"schema_version":"1.0","source":{"id":"1406.5571","kind":"arxiv","version":1}},"canonical_sha256":"9bcfbe0b7096448c5376f3749ca908f796255b440b97e187738af03d374c95a5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9bcfbe0b7096448c5376f3749ca908f796255b440b97e187738af03d374c95a5","first_computed_at":"2026-05-18T02:47:15.181141Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:47:15.181141Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"B77SVnDHvTP00PSPrbJy5UxrrCIp4jxT5RIRQcSCgH8+BXdqMmEhnkHsSKqsvlrL7cdB05zq+3i/BTJ9G5x6Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:47:15.181601Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.5571","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3de97a0945b0245c400eb4e4db724c82b6d415bab321349be48a5889ac8feef5","sha256:5abb8b63505981caf0c17d8ae8c0361771e3a40c5a499947bbfaf2f27427492e"],"state_sha256":"5bed428d561860e2f94033f7f7cf95e967e5ae13b5fd9e8fd296fa01b02d5d9b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rVNFoBuhcpH+Gpi51xRnN1WrA0Ofu7FCpU+y9F/wv6T6HbG0lQIqoxWekvYSaePLLVzJBTGk6hOEjLd/9gtZBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-20T08:45:43.089835Z","bundle_sha256":"3066b93d4fbc91946c18f560c56de2934f1998ec4dc8ad2e6300d0d5eaeb0f93"}}