{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:VH4YRGVBN32R4SLO42E5ZI4VMV","short_pith_number":"pith:VH4YRGVB","canonical_record":{"source":{"id":"1408.3433","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-14T21:15:55Z","cross_cats_sorted":[],"title_canon_sha256":"b02b32e0d3970471e86d8fce8492b107d47d284f23ae795ad93f3c724dd2a62f","abstract_canon_sha256":"349b32cb437816fcf01c8a6bdefe06f38dcf6b7c18d56cb68982288e4463e4c7"},"schema_version":"1.0"},"canonical_sha256":"a9f9889aa16ef51e496ee689dca395656bf25f1f1d07bc66ca3a8b279c0452c5","source":{"kind":"arxiv","id":"1408.3433","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3433","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3433v1","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3433","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"pith_short_12","alias_value":"VH4YRGVBN32R","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VH4YRGVBN32R4SLO","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VH4YRGVB","created_at":"2026-05-18T12:28:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:VH4YRGVBN32R4SLO42E5ZI4VMV","target":"record","payload":{"canonical_record":{"source":{"id":"1408.3433","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-14T21:15:55Z","cross_cats_sorted":[],"title_canon_sha256":"b02b32e0d3970471e86d8fce8492b107d47d284f23ae795ad93f3c724dd2a62f","abstract_canon_sha256":"349b32cb437816fcf01c8a6bdefe06f38dcf6b7c18d56cb68982288e4463e4c7"},"schema_version":"1.0"},"canonical_sha256":"a9f9889aa16ef51e496ee689dca395656bf25f1f1d07bc66ca3a8b279c0452c5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:18.819482Z","signature_b64":"nQBWSzcNQhUqnxXgN9OlKwb5dgugrY5T4ZSsKA0VI6/YOcgiv86zdH44JYNtcDE2SR9I/ge80gkIzTd1eWQnCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9f9889aa16ef51e496ee689dca395656bf25f1f1d07bc66ca3a8b279c0452c5","last_reissued_at":"2026-05-18T01:42:18.818822Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:18.818822Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.3433","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":"2026-05-18T01:42:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BnGenzu0j4flI6A0wqJTsnPtARTv5zmNAvypQ6H9y6/gt2uimwFqATx6kIyceL1Cal67FpHpalzqtqvjTU24Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T08:31:15.141553Z"},"content_sha256":"66fe017de5dfd42462178d97e8b8555d4ab046c84f32ebc39ffa6f07d1ec8420","schema_version":"1.0","event_id":"sha256:66fe017de5dfd42462178d97e8b8555d4ab046c84f32ebc39ffa6f07d1ec8420"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:VH4YRGVBN32R4SLO42E5ZI4VMV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrafast reduction in exchange interaction by a laser pulse: Alternative path to femtomagnetism","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"G. P. Zhang, Mingqiang Gu, X. S. Wu","submitted_at":"2014-08-14T21:15:55Z","abstract_excerpt":"Since the beginning of femtomagnetism, it has been hotly debated how an ultrafast laser pulse can demagnetize a sample and switch its spins within a few hundred femtoseconds, but no consensus has been reached. In this paper, we propose that an ultrafast reduction in the exchange interaction by a femtosecond laser pulse is mainly responsible for demagnetization and spin switching. The key physics is that the dipole selection rule demands two distinctive electron configurations for the ground and excited states and consequently changes the exchange interaction. Although the exchange interaction "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3433","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":"2026-05-18T01:42:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gCVxVodjtMac88B6wt4NieWbIPOAYt2YdOAExs0EogR1M+o2vfcXoh/GSVUwAqjQvdZf0XYXVuD0mEGp4yr6Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T08:31:15.141906Z"},"content_sha256":"007472e264296151a1c5557c48038923e552a317aeb43435045597d2ec2ecd88","schema_version":"1.0","event_id":"sha256:007472e264296151a1c5557c48038923e552a317aeb43435045597d2ec2ecd88"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/bundle.json","state_url":"https://pith.science/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/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":"2026-05-21T08:31:15Z","links":{"resolver":"https://pith.science/pith/VH4YRGVBN32R4SLO42E5ZI4VMV","bundle":"https://pith.science/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/bundle.json","state":"https://pith.science/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VH4YRGVBN32R4SLO42E5ZI4VMV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:VH4YRGVBN32R4SLO42E5ZI4VMV","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":"349b32cb437816fcf01c8a6bdefe06f38dcf6b7c18d56cb68982288e4463e4c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-14T21:15:55Z","title_canon_sha256":"b02b32e0d3970471e86d8fce8492b107d47d284f23ae795ad93f3c724dd2a62f"},"schema_version":"1.0","source":{"id":"1408.3433","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3433","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3433v1","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3433","created_at":"2026-05-18T01:42:18Z"},{"alias_kind":"pith_short_12","alias_value":"VH4YRGVBN32R","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"VH4YRGVBN32R4SLO","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"VH4YRGVB","created_at":"2026-05-18T12:28:54Z"}],"graph_snapshots":[{"event_id":"sha256:007472e264296151a1c5557c48038923e552a317aeb43435045597d2ec2ecd88","target":"graph","created_at":"2026-05-18T01:42:18Z","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":"Since the beginning of femtomagnetism, it has been hotly debated how an ultrafast laser pulse can demagnetize a sample and switch its spins within a few hundred femtoseconds, but no consensus has been reached. In this paper, we propose that an ultrafast reduction in the exchange interaction by a femtosecond laser pulse is mainly responsible for demagnetization and spin switching. The key physics is that the dipole selection rule demands two distinctive electron configurations for the ground and excited states and consequently changes the exchange interaction. Although the exchange interaction ","authors_text":"G. P. Zhang, Mingqiang Gu, X. S. Wu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-14T21:15:55Z","title":"Ultrafast reduction in exchange interaction by a laser pulse: Alternative path to femtomagnetism"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3433","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":"sha256:66fe017de5dfd42462178d97e8b8555d4ab046c84f32ebc39ffa6f07d1ec8420","target":"record","created_at":"2026-05-18T01:42:18Z","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":"349b32cb437816fcf01c8a6bdefe06f38dcf6b7c18d56cb68982288e4463e4c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-08-14T21:15:55Z","title_canon_sha256":"b02b32e0d3970471e86d8fce8492b107d47d284f23ae795ad93f3c724dd2a62f"},"schema_version":"1.0","source":{"id":"1408.3433","kind":"arxiv","version":1}},"canonical_sha256":"a9f9889aa16ef51e496ee689dca395656bf25f1f1d07bc66ca3a8b279c0452c5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9f9889aa16ef51e496ee689dca395656bf25f1f1d07bc66ca3a8b279c0452c5","first_computed_at":"2026-05-18T01:42:18.818822Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:18.818822Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nQBWSzcNQhUqnxXgN9OlKwb5dgugrY5T4ZSsKA0VI6/YOcgiv86zdH44JYNtcDE2SR9I/ge80gkIzTd1eWQnCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:18.819482Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.3433","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:66fe017de5dfd42462178d97e8b8555d4ab046c84f32ebc39ffa6f07d1ec8420","sha256:007472e264296151a1c5557c48038923e552a317aeb43435045597d2ec2ecd88"],"state_sha256":"4cf134dd2914cf27592c17dff0ba677297d0d1e47978a35d8b1bb9ed6837e1cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WHyCojSdgBM//ExdLpMEFpAkXGFbcwQg3fC0zFxJVSdfqX5NH8B77crCjWC64G2Eu/E+xMyZbsmgz148rAMjDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T08:31:15.144235Z","bundle_sha256":"c1a37e5f8bf3cf93f5dc52cd13766f1e478314b0090f4be578dce317237d9bde"}}