{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:UIF7ZKRTXG7YGYHI7RIXU32JXY","short_pith_number":"pith:UIF7ZKRT","canonical_record":{"source":{"id":"2003.09612","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2020-03-21T09:38:25Z","cross_cats_sorted":[],"title_canon_sha256":"2dd2942035db2a4d17c53cd1a0cb550fac38ce428fe70c102893d4ca0856a333","abstract_canon_sha256":"71b8567863dcb23c77ed2ddcb503b8e0429c7ddc86324c75a687c8452e294212"},"schema_version":"1.0"},"canonical_sha256":"a20bfcaa33b9bf8360e8fc517a6f49be1b4ffa6c7a2b357a0a363b3988c9482f","source":{"kind":"arxiv","id":"2003.09612","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.09612","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"arxiv_version","alias_value":"2003.09612v1","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.09612","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_12","alias_value":"UIF7ZKRTXG7Y","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_16","alias_value":"UIF7ZKRTXG7YGYHI","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_8","alias_value":"UIF7ZKRT","created_at":"2026-07-05T01:16:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:UIF7ZKRTXG7YGYHI7RIXU32JXY","target":"record","payload":{"canonical_record":{"source":{"id":"2003.09612","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2020-03-21T09:38:25Z","cross_cats_sorted":[],"title_canon_sha256":"2dd2942035db2a4d17c53cd1a0cb550fac38ce428fe70c102893d4ca0856a333","abstract_canon_sha256":"71b8567863dcb23c77ed2ddcb503b8e0429c7ddc86324c75a687c8452e294212"},"schema_version":"1.0"},"canonical_sha256":"a20bfcaa33b9bf8360e8fc517a6f49be1b4ffa6c7a2b357a0a363b3988c9482f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:16:46.514469Z","signature_b64":"37c8pqlsg9KnQA5ZK15MG0e3FoxkjCDAsiupPAiAc9Iz2TtB5kAN7Hp0qraa04P6w1k5Qz85MHVBUStT8YpWAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a20bfcaa33b9bf8360e8fc517a6f49be1b4ffa6c7a2b357a0a363b3988c9482f","last_reissued_at":"2026-07-05T01:16:46.514114Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:16:46.514114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.09612","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":"2026-07-05T01:16:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mufNrEDMiF4Ch9DFxLJOGYt21fAdbE/YLPX22cb/Jm+4F4MJT77c4S/3im/9ek9wEwdQ/YH6d6WhAg7V+ZYcDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:48:48.397007Z"},"content_sha256":"94f51f87f1fdedf9514148b3aad5fb087217164d24eef175367b0481a403fb93","schema_version":"1.0","event_id":"sha256:94f51f87f1fdedf9514148b3aad5fb087217164d24eef175367b0481a403fb93"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:UIF7ZKRTXG7YGYHI7RIXU32JXY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Evidence of tunable magnetic coupling in hydrogenated graphene","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Chuanwu Cao, Jian-Hao Chen, Shibing Tian, Shimin Cao","submitted_at":"2020-03-21T09:38:25Z","abstract_excerpt":"A lot of efforts have been devoted to understanding the origin and effects of magnetic moments induced in graphene with carbon atom vacancy, or light adatoms like hydrogen or fluorine. At the meantime, the large negative magnetoresistance (MR) widely observed in these systems is not well understood, nor had it been associated with the presence of magnetic moments. In this paper, we study the systematic evolution of the large negative MR of in-situ hydrogenated graphene in ultra-high vacuum (UHV) environment. We find for most combination of electron density ($n_e$) and hydrogen density ($n_H$),"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.09612","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2003.09612/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:16:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LLfrKOzsq0ucIh8wPP86t8VBaIs78qd5A73o26lYghH3Q6PXcChIyFPG2G4EEY1KpowKOKoptZtdGM06FEp8Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-03T21:48:48.398024Z"},"content_sha256":"bb4ee7fcbc6bfd55eec1c5a7583cfb199904b96ad3fdb6e4c1814b34c33cce67","schema_version":"1.0","event_id":"sha256:bb4ee7fcbc6bfd55eec1c5a7583cfb199904b96ad3fdb6e4c1814b34c33cce67"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/bundle.json","state_url":"https://pith.science/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/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":"2026-08-03T21:48:48Z","links":{"resolver":"https://pith.science/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY","bundle":"https://pith.science/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/bundle.json","state":"https://pith.science/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UIF7ZKRTXG7YGYHI7RIXU32JXY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:UIF7ZKRTXG7YGYHI7RIXU32JXY","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":"71b8567863dcb23c77ed2ddcb503b8e0429c7ddc86324c75a687c8452e294212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2020-03-21T09:38:25Z","title_canon_sha256":"2dd2942035db2a4d17c53cd1a0cb550fac38ce428fe70c102893d4ca0856a333"},"schema_version":"1.0","source":{"id":"2003.09612","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.09612","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"arxiv_version","alias_value":"2003.09612v1","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.09612","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_12","alias_value":"UIF7ZKRTXG7Y","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_16","alias_value":"UIF7ZKRTXG7YGYHI","created_at":"2026-07-05T01:16:46Z"},{"alias_kind":"pith_short_8","alias_value":"UIF7ZKRT","created_at":"2026-07-05T01:16:46Z"}],"graph_snapshots":[{"event_id":"sha256:bb4ee7fcbc6bfd55eec1c5a7583cfb199904b96ad3fdb6e4c1814b34c33cce67","target":"graph","created_at":"2026-07-05T01:16:46Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2003.09612/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A lot of efforts have been devoted to understanding the origin and effects of magnetic moments induced in graphene with carbon atom vacancy, or light adatoms like hydrogen or fluorine. At the meantime, the large negative magnetoresistance (MR) widely observed in these systems is not well understood, nor had it been associated with the presence of magnetic moments. In this paper, we study the systematic evolution of the large negative MR of in-situ hydrogenated graphene in ultra-high vacuum (UHV) environment. We find for most combination of electron density ($n_e$) and hydrogen density ($n_H$),","authors_text":"Chuanwu Cao, Jian-Hao Chen, Shibing Tian, Shimin Cao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2020-03-21T09:38:25Z","title":"Evidence of tunable magnetic coupling in hydrogenated graphene"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.09612","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":"sha256:94f51f87f1fdedf9514148b3aad5fb087217164d24eef175367b0481a403fb93","target":"record","created_at":"2026-07-05T01:16:46Z","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":"71b8567863dcb23c77ed2ddcb503b8e0429c7ddc86324c75a687c8452e294212","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2020-03-21T09:38:25Z","title_canon_sha256":"2dd2942035db2a4d17c53cd1a0cb550fac38ce428fe70c102893d4ca0856a333"},"schema_version":"1.0","source":{"id":"2003.09612","kind":"arxiv","version":1}},"canonical_sha256":"a20bfcaa33b9bf8360e8fc517a6f49be1b4ffa6c7a2b357a0a363b3988c9482f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a20bfcaa33b9bf8360e8fc517a6f49be1b4ffa6c7a2b357a0a363b3988c9482f","first_computed_at":"2026-07-05T01:16:46.514114Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:16:46.514114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"37c8pqlsg9KnQA5ZK15MG0e3FoxkjCDAsiupPAiAc9Iz2TtB5kAN7Hp0qraa04P6w1k5Qz85MHVBUStT8YpWAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:16:46.514469Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.09612","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:94f51f87f1fdedf9514148b3aad5fb087217164d24eef175367b0481a403fb93","sha256:bb4ee7fcbc6bfd55eec1c5a7583cfb199904b96ad3fdb6e4c1814b34c33cce67"],"state_sha256":"31f14a723721acab090b7fcbe9132868143c1384c86d1e3926f9abcf2d115e3a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FA2qKBACLAfVg1Q+oAmVvzru1gxD641QqU32kpmeYrZanwUonmHGrUfD9OxKAVzrY1I8Qcxq5eK9CjLPqGe0AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-03T21:48:48.406300Z","bundle_sha256":"b0783739affbd348802b2f735796e314fb0997780a6762aea6c354a92e78b309"}}