{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:7FSOBYBMQKFDM3CD6CDAA7CBNL","short_pith_number":"pith:7FSOBYBM","canonical_record":{"source":{"id":"0910.2070","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-10-12T02:16:30Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"ef3f8a2153135b5a42ddec9d9beeb4d224e6fbc0771110ce7268fbe63c89ea1f","abstract_canon_sha256":"7f5989f574f5e52f57d912c34885eaecd5b720f46db7000fc4f566b6363342d3"},"schema_version":"1.0"},"canonical_sha256":"f964e0e02c828a366c43f086007c416aeadd65eb775ce5c6cabf0031e9312183","source":{"kind":"arxiv","id":"0910.2070","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.2070","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"arxiv_version","alias_value":"0910.2070v2","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.2070","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"pith_short_12","alias_value":"7FSOBYBMQKFD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"7FSOBYBMQKFDM3CD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"7FSOBYBM","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:7FSOBYBMQKFDM3CD6CDAA7CBNL","target":"record","payload":{"canonical_record":{"source":{"id":"0910.2070","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-10-12T02:16:30Z","cross_cats_sorted":["cond-mat.supr-con"],"title_canon_sha256":"ef3f8a2153135b5a42ddec9d9beeb4d224e6fbc0771110ce7268fbe63c89ea1f","abstract_canon_sha256":"7f5989f574f5e52f57d912c34885eaecd5b720f46db7000fc4f566b6363342d3"},"schema_version":"1.0"},"canonical_sha256":"f964e0e02c828a366c43f086007c416aeadd65eb775ce5c6cabf0031e9312183","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:24:46.850285Z","signature_b64":"n1JMLTxQpkNpb4FkJ7He5KqpwlX9MbqwJLHKHcX0AU6M+7cb4GXydPRhv0hnFrZKE2Gkrbo0SOZRmCZfV2zIDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f964e0e02c828a366c43f086007c416aeadd65eb775ce5c6cabf0031e9312183","last_reissued_at":"2026-05-18T02:24:46.849845Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:24:46.849845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0910.2070","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":"2026-05-18T02:24:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IKNwTRzCpF7JMQaYoV31b6RV+ZyMlTCPP5VwqAsbDiv9U6P7Vjkw4dsPmEVuMobWWVY3Sl85ofX+8Huj0CwuAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T06:22:18.539434Z"},"content_sha256":"b12e2f9f57c4bc8c6072d2793b51638b6a3300d426c8b45bc094d5626537f4ab","schema_version":"1.0","event_id":"sha256:b12e2f9f57c4bc8c6072d2793b51638b6a3300d426c8b45bc094d5626537f4ab"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:7FSOBYBMQKFDM3CD6CDAA7CBNL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum spin liquid with fermionized pi-vortices","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.supr-con"],"primary_cat":"cond-mat.str-el","authors_text":"Jing He, Lan-Feng Liu, Su-Peng Kou, Ya-Jie Wu","submitted_at":"2009-10-12T02:16:30Z","abstract_excerpt":"In this paper, we study the non-magnetic insulator state near Mott transition of 2D pi-flux Hubbard model on square lattice and find that such non-magnetic insulator state is quantum spin liquid state with nodal fermionic excitations - nodal spin liquid (NSL). When there exists small easy-plane anisotropic energy, the ground state becomes Z2 topological spin liquid (TSL) with full gapped excitations. The U(1)times U(1) mutual--Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.2070","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":"2026-05-18T02:24:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JiRCrBDaF0GkzCja4phhYVZyIroFeQrdoQxhFICw3/bQTNc3uSXgnhrCeiP4nn49Jj3RIdFj3Pr24dRlfQsFBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T06:22:18.540108Z"},"content_sha256":"84595be9aaa9d12a772056c68c7d4750c5f7763d192e834d001178b87f3fb915","schema_version":"1.0","event_id":"sha256:84595be9aaa9d12a772056c68c7d4750c5f7763d192e834d001178b87f3fb915"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/bundle.json","state_url":"https://pith.science/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/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":"2026-05-30T06:22:18Z","links":{"resolver":"https://pith.science/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL","bundle":"https://pith.science/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/bundle.json","state":"https://pith.science/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7FSOBYBMQKFDM3CD6CDAA7CBNL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:7FSOBYBMQKFDM3CD6CDAA7CBNL","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":"7f5989f574f5e52f57d912c34885eaecd5b720f46db7000fc4f566b6363342d3","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-10-12T02:16:30Z","title_canon_sha256":"ef3f8a2153135b5a42ddec9d9beeb4d224e6fbc0771110ce7268fbe63c89ea1f"},"schema_version":"1.0","source":{"id":"0910.2070","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0910.2070","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"arxiv_version","alias_value":"0910.2070v2","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0910.2070","created_at":"2026-05-18T02:24:46Z"},{"alias_kind":"pith_short_12","alias_value":"7FSOBYBMQKFD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"7FSOBYBMQKFDM3CD","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"7FSOBYBM","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:84595be9aaa9d12a772056c68c7d4750c5f7763d192e834d001178b87f3fb915","target":"graph","created_at":"2026-05-18T02:24:46Z","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"},"paper":{"abstract_excerpt":"In this paper, we study the non-magnetic insulator state near Mott transition of 2D pi-flux Hubbard model on square lattice and find that such non-magnetic insulator state is quantum spin liquid state with nodal fermionic excitations - nodal spin liquid (NSL). When there exists small easy-plane anisotropic energy, the ground state becomes Z2 topological spin liquid (TSL) with full gapped excitations. The U(1)times U(1) mutual--Chern-Simons (MCS) theory is obtained to describe the low energy physics of NSL and TSL.","authors_text":"Jing He, Lan-Feng Liu, Su-Peng Kou, Ya-Jie Wu","cross_cats":["cond-mat.supr-con"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-10-12T02:16:30Z","title":"Quantum spin liquid with fermionized pi-vortices"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0910.2070","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:b12e2f9f57c4bc8c6072d2793b51638b6a3300d426c8b45bc094d5626537f4ab","target":"record","created_at":"2026-05-18T02:24:46Z","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":"7f5989f574f5e52f57d912c34885eaecd5b720f46db7000fc4f566b6363342d3","cross_cats_sorted":["cond-mat.supr-con"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2009-10-12T02:16:30Z","title_canon_sha256":"ef3f8a2153135b5a42ddec9d9beeb4d224e6fbc0771110ce7268fbe63c89ea1f"},"schema_version":"1.0","source":{"id":"0910.2070","kind":"arxiv","version":2}},"canonical_sha256":"f964e0e02c828a366c43f086007c416aeadd65eb775ce5c6cabf0031e9312183","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f964e0e02c828a366c43f086007c416aeadd65eb775ce5c6cabf0031e9312183","first_computed_at":"2026-05-18T02:24:46.849845Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:24:46.849845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"n1JMLTxQpkNpb4FkJ7He5KqpwlX9MbqwJLHKHcX0AU6M+7cb4GXydPRhv0hnFrZKE2Gkrbo0SOZRmCZfV2zIDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:24:46.850285Z","signed_message":"canonical_sha256_bytes"},"source_id":"0910.2070","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b12e2f9f57c4bc8c6072d2793b51638b6a3300d426c8b45bc094d5626537f4ab","sha256:84595be9aaa9d12a772056c68c7d4750c5f7763d192e834d001178b87f3fb915"],"state_sha256":"8f3dbfebdc74e68a5af9b19f41b36e3653f7963139df4369ff54c1b25acd44e9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K8vE/gUpXfg+wVikmyPX4uNmaCZ5irQg5lsc8VXcWFoJFjtmAM5X9etZD+w86UkDypbGyKvCEpZfbJDDcliiAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T06:22:18.545069Z","bundle_sha256":"7bb386be660eb182b4c8a760185fbba20e58a3fccd5f380253779b8bff708263"}}