{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:6RGZBOCPZ4QTEESYYZPMUDGCBT","short_pith_number":"pith:6RGZBOCP","canonical_record":{"source":{"id":"1311.1979","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-11-08T14:20:01Z","cross_cats_sorted":[],"title_canon_sha256":"4919f9cbf58338f8f6d11c2459e49d0ba9cb73397f0304321be6eed0b731c61d","abstract_canon_sha256":"f5d62d2cf45316be1a2bee35dd3e282a31fb31679f648572d030485a60f981bf"},"schema_version":"1.0"},"canonical_sha256":"f44d90b84fcf21321258c65eca0cc20cfbfc0896c745485ca8f775dfe3f772e8","source":{"kind":"arxiv","id":"1311.1979","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1979","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1979v2","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1979","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"pith_short_12","alias_value":"6RGZBOCPZ4QT","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"6RGZBOCPZ4QTEESY","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"6RGZBOCP","created_at":"2026-05-18T12:27:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:6RGZBOCPZ4QTEESYYZPMUDGCBT","target":"record","payload":{"canonical_record":{"source":{"id":"1311.1979","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-11-08T14:20:01Z","cross_cats_sorted":[],"title_canon_sha256":"4919f9cbf58338f8f6d11c2459e49d0ba9cb73397f0304321be6eed0b731c61d","abstract_canon_sha256":"f5d62d2cf45316be1a2bee35dd3e282a31fb31679f648572d030485a60f981bf"},"schema_version":"1.0"},"canonical_sha256":"f44d90b84fcf21321258c65eca0cc20cfbfc0896c745485ca8f775dfe3f772e8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:02:58.973196Z","signature_b64":"gmtU4BE9IKTBaPKmKJnJFcddhHfgssj9hMc/LyKuH7/mnoD31coy/sVcnRvnnHFieyMgHad7tiHTanGsD7nNCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f44d90b84fcf21321258c65eca0cc20cfbfc0896c745485ca8f775dfe3f772e8","last_reissued_at":"2026-05-18T03:02:58.972474Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:02:58.972474Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.1979","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":"2026-05-18T03:02:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EVEa4M1zEy7Go8q2hIA0HGZ9zU1ffoCHaSCOXBOMlMbR3zR4Blu8iFqunj4zC9QCvWjUQGZ4GgkpiD9y7e6VAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:14:23.050170Z"},"content_sha256":"992120b521b2a2c8c9a7d4458cc8be65aa0c2f3be5a537bd1dc75db5bd5a43de","schema_version":"1.0","event_id":"sha256:992120b521b2a2c8c9a7d4458cc8be65aa0c2f3be5a537bd1dc75db5bd5a43de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:6RGZBOCPZ4QTEESYYZPMUDGCBT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra long spin decoherence times in graphene quantum dots with a small number of nuclear spins","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Bj\\\"orn Trauzettel, John Schliemann, Moritz Fuchs","submitted_at":"2013-11-08T14:20:01Z","abstract_excerpt":"We study the dynamics of an electron spin in a graphene quantum dot, which is interacting with a bath of less than ten nuclear spins via the anisotropic hyperfine interaction. Due to substantial progress in the fabrication of graphene quantum dots, the consideration of such a small number of nuclear spins is experimentally relevant. This choice allows us to use exact diagonalization to calculate the longtime average of the electron spin as well as its decoherence time. We investigate the dependence of spin observables on the initial states of nuclear spins and on the position of nuclear spins "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1979","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":"2026-05-18T03:02:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7Yag77OarjQo7uI/FgQlFpcdMeOSr+WE+StrDaXM3aD1jOwmsCg7HD7YgWBsNd8pZhAGBnR0tRq6K28X+AE9Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T18:14:23.050531Z"},"content_sha256":"535616b2230120400a2846ed9abe225c6f7d0399e6d3b3b4301c274fb2219113","schema_version":"1.0","event_id":"sha256:535616b2230120400a2846ed9abe225c6f7d0399e6d3b3b4301c274fb2219113"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/bundle.json","state_url":"https://pith.science/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/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":"2026-05-19T18:14:23Z","links":{"resolver":"https://pith.science/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT","bundle":"https://pith.science/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/bundle.json","state":"https://pith.science/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6RGZBOCPZ4QTEESYYZPMUDGCBT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:6RGZBOCPZ4QTEESYYZPMUDGCBT","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":"f5d62d2cf45316be1a2bee35dd3e282a31fb31679f648572d030485a60f981bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-11-08T14:20:01Z","title_canon_sha256":"4919f9cbf58338f8f6d11c2459e49d0ba9cb73397f0304321be6eed0b731c61d"},"schema_version":"1.0","source":{"id":"1311.1979","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.1979","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"arxiv_version","alias_value":"1311.1979v2","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.1979","created_at":"2026-05-18T03:02:58Z"},{"alias_kind":"pith_short_12","alias_value":"6RGZBOCPZ4QT","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"6RGZBOCPZ4QTEESY","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"6RGZBOCP","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:535616b2230120400a2846ed9abe225c6f7d0399e6d3b3b4301c274fb2219113","target":"graph","created_at":"2026-05-18T03:02:58Z","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 study the dynamics of an electron spin in a graphene quantum dot, which is interacting with a bath of less than ten nuclear spins via the anisotropic hyperfine interaction. Due to substantial progress in the fabrication of graphene quantum dots, the consideration of such a small number of nuclear spins is experimentally relevant. This choice allows us to use exact diagonalization to calculate the longtime average of the electron spin as well as its decoherence time. We investigate the dependence of spin observables on the initial states of nuclear spins and on the position of nuclear spins ","authors_text":"Bj\\\"orn Trauzettel, John Schliemann, Moritz Fuchs","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-11-08T14:20:01Z","title":"Ultra long spin decoherence times in graphene quantum dots with a small number of nuclear spins"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.1979","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":"sha256:992120b521b2a2c8c9a7d4458cc8be65aa0c2f3be5a537bd1dc75db5bd5a43de","target":"record","created_at":"2026-05-18T03:02:58Z","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":"f5d62d2cf45316be1a2bee35dd3e282a31fb31679f648572d030485a60f981bf","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2013-11-08T14:20:01Z","title_canon_sha256":"4919f9cbf58338f8f6d11c2459e49d0ba9cb73397f0304321be6eed0b731c61d"},"schema_version":"1.0","source":{"id":"1311.1979","kind":"arxiv","version":2}},"canonical_sha256":"f44d90b84fcf21321258c65eca0cc20cfbfc0896c745485ca8f775dfe3f772e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f44d90b84fcf21321258c65eca0cc20cfbfc0896c745485ca8f775dfe3f772e8","first_computed_at":"2026-05-18T03:02:58.972474Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:02:58.972474Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gmtU4BE9IKTBaPKmKJnJFcddhHfgssj9hMc/LyKuH7/mnoD31coy/sVcnRvnnHFieyMgHad7tiHTanGsD7nNCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:02:58.973196Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.1979","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:992120b521b2a2c8c9a7d4458cc8be65aa0c2f3be5a537bd1dc75db5bd5a43de","sha256:535616b2230120400a2846ed9abe225c6f7d0399e6d3b3b4301c274fb2219113"],"state_sha256":"c06c8a43b19b142c7f5883ae9507ba00b77050b25759f87e6ebb0175456030c5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7TKSmPcvf9HmmPPkWQ5/kGIPc1JBLsgpwrD6QZR1weLjCoosKLEROn0qN9F/Wwyme1IGteGGgJC5e7HTVIRJBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T18:14:23.052726Z","bundle_sha256":"a885c2877842443aed570ebf08976208f1620a3a514aa922bb9a77be629d9188"}}