{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:KP4Q6EQZVIKWPNVSU5T4QFXQXT","short_pith_number":"pith:KP4Q6EQZ","canonical_record":{"source":{"id":"1901.02741","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-01-08T04:08:17Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"d101928c69be2ca5ec813998e5b3c4cf02dc649cb50097eb70ac48d483c2932b","abstract_canon_sha256":"5b4bd669985fa1a4b276f7233850273b750b5dcc38ddc44fef05c9cbec6e47b8"},"schema_version":"1.0"},"canonical_sha256":"53f90f1219aa1567b6b2a767c816f0bcd8560d3b8aa073241bcc3ad704427d6f","source":{"kind":"arxiv","id":"1901.02741","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02741","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02741v1","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02741","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"pith_short_12","alias_value":"KP4Q6EQZVIKW","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"KP4Q6EQZVIKWPNVS","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"KP4Q6EQZ","created_at":"2026-05-18T12:33:21Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:KP4Q6EQZVIKWPNVSU5T4QFXQXT","target":"record","payload":{"canonical_record":{"source":{"id":"1901.02741","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-01-08T04:08:17Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"d101928c69be2ca5ec813998e5b3c4cf02dc649cb50097eb70ac48d483c2932b","abstract_canon_sha256":"5b4bd669985fa1a4b276f7233850273b750b5dcc38ddc44fef05c9cbec6e47b8"},"schema_version":"1.0"},"canonical_sha256":"53f90f1219aa1567b6b2a767c816f0bcd8560d3b8aa073241bcc3ad704427d6f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:08.620720Z","signature_b64":"/9UW1AauxMZlLzYongakTZewlclO0Kef6IUeonlzYoWPFyroWtyN3dFJtid9ZpkfDq8DFl04opsCW99MYmJ7AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53f90f1219aa1567b6b2a767c816f0bcd8560d3b8aa073241bcc3ad704427d6f","last_reissued_at":"2026-05-17T23:50:08.620320Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:08.620320Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.02741","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":"2026-05-17T23:50:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MIY3V+6H8Eqr456zt/FEzIGdMJBn7zFrMEH8HBbF/oHsiDge/N72qYVCNOt//1sX/9ITzQjimHmfEFvJktsLAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T12:37:38.629708Z"},"content_sha256":"e6b052a66ac5a3a398c271c59d957a23f5c3e5e755b5f3c555098aab7b95cedb","schema_version":"1.0","event_id":"sha256:e6b052a66ac5a3a398c271c59d957a23f5c3e5e755b5f3c555098aab7b95cedb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:KP4Q6EQZVIKWPNVSU5T4QFXQXT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Femtosecond-Laser-Induced Spin-Polarized Electron Emission from a GaAs Tip","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"physics.optics","authors_text":"Eric R. Jones, Evan Brunkow, Herman Batelaan, T. J. Gay","submitted_at":"2019-01-08T04:08:17Z","abstract_excerpt":"It is shown that focusing circularly-polarized 800 nm light pulses of 100 fs duration on the tips of p-GaAs crystalline shards having no negative electron affinity (NEA) activation results in electron emission that is both fast and spin-polarized. The 400 fs duration of the emission process was determined by pump/probe measurements. The three samples we investigated produced electron polarizations of 13.1(9)%, 13.3(7)%, and 10.4(2)%. Emission currents ranged between 50 pA and 3 nA with a sample bias of -100V and average laser power of 100 mW. The electron emission exhibited linear dichroism an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02741","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":"2026-05-17T23:50:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NFr4nTZ37yl7Bl9avJq3CdU3x0tsuM/BBuldycOwStv/Myw4gQ+UT9UXecFBAm4NG5HLxj5PvAS/kU/z7NUSDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-25T12:37:38.630059Z"},"content_sha256":"a5b65fb2c5145228d6993875a0b2f2c2e8420c7ea19042ad1ee55b6519dbe8e3","schema_version":"1.0","event_id":"sha256:a5b65fb2c5145228d6993875a0b2f2c2e8420c7ea19042ad1ee55b6519dbe8e3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/bundle.json","state_url":"https://pith.science/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/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":"2026-06-25T12:37:38Z","links":{"resolver":"https://pith.science/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT","bundle":"https://pith.science/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/bundle.json","state":"https://pith.science/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KP4Q6EQZVIKWPNVSU5T4QFXQXT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:KP4Q6EQZVIKWPNVSU5T4QFXQXT","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":"5b4bd669985fa1a4b276f7233850273b750b5dcc38ddc44fef05c9cbec6e47b8","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-01-08T04:08:17Z","title_canon_sha256":"d101928c69be2ca5ec813998e5b3c4cf02dc649cb50097eb70ac48d483c2932b"},"schema_version":"1.0","source":{"id":"1901.02741","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02741","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02741v1","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02741","created_at":"2026-05-17T23:50:08Z"},{"alias_kind":"pith_short_12","alias_value":"KP4Q6EQZVIKW","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_16","alias_value":"KP4Q6EQZVIKWPNVS","created_at":"2026-05-18T12:33:21Z"},{"alias_kind":"pith_short_8","alias_value":"KP4Q6EQZ","created_at":"2026-05-18T12:33:21Z"}],"graph_snapshots":[{"event_id":"sha256:a5b65fb2c5145228d6993875a0b2f2c2e8420c7ea19042ad1ee55b6519dbe8e3","target":"graph","created_at":"2026-05-17T23:50:08Z","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":"It is shown that focusing circularly-polarized 800 nm light pulses of 100 fs duration on the tips of p-GaAs crystalline shards having no negative electron affinity (NEA) activation results in electron emission that is both fast and spin-polarized. The 400 fs duration of the emission process was determined by pump/probe measurements. The three samples we investigated produced electron polarizations of 13.1(9)%, 13.3(7)%, and 10.4(2)%. Emission currents ranged between 50 pA and 3 nA with a sample bias of -100V and average laser power of 100 mW. The electron emission exhibited linear dichroism an","authors_text":"Eric R. Jones, Evan Brunkow, Herman Batelaan, T. J. Gay","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-01-08T04:08:17Z","title":"Femtosecond-Laser-Induced Spin-Polarized Electron Emission from a GaAs Tip"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02741","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:e6b052a66ac5a3a398c271c59d957a23f5c3e5e755b5f3c555098aab7b95cedb","target":"record","created_at":"2026-05-17T23:50:08Z","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":"5b4bd669985fa1a4b276f7233850273b750b5dcc38ddc44fef05c9cbec6e47b8","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2019-01-08T04:08:17Z","title_canon_sha256":"d101928c69be2ca5ec813998e5b3c4cf02dc649cb50097eb70ac48d483c2932b"},"schema_version":"1.0","source":{"id":"1901.02741","kind":"arxiv","version":1}},"canonical_sha256":"53f90f1219aa1567b6b2a767c816f0bcd8560d3b8aa073241bcc3ad704427d6f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"53f90f1219aa1567b6b2a767c816f0bcd8560d3b8aa073241bcc3ad704427d6f","first_computed_at":"2026-05-17T23:50:08.620320Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:08.620320Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/9UW1AauxMZlLzYongakTZewlclO0Kef6IUeonlzYoWPFyroWtyN3dFJtid9ZpkfDq8DFl04opsCW99MYmJ7AQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:08.620720Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.02741","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e6b052a66ac5a3a398c271c59d957a23f5c3e5e755b5f3c555098aab7b95cedb","sha256:a5b65fb2c5145228d6993875a0b2f2c2e8420c7ea19042ad1ee55b6519dbe8e3"],"state_sha256":"e149c981f7b18cb585845540c5162b3494e8b50e8732866dad19a1ce040ff76f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6s60Yqorl9lUCZCOCNeyoml360nOJsm7Bs811zP0Lh/2nF3r7/XVk6NqGrXU+RRcbU2xAzTnlSUaPn5Wv3nGAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-25T12:37:38.632009Z","bundle_sha256":"db5ffa114d63aa92cd44fef3495502e60d27aaf7af180d1def1f832c0f118efa"}}