{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:NM4VFGY3PORKW5AIS4MUIYRCTF","short_pith_number":"pith:NM4VFGY3","canonical_record":{"source":{"id":"0902.1479","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-02-09T17:16:34Z","cross_cats_sorted":[],"title_canon_sha256":"b19bfb473e72e8d4a8c6e8d8c02bc8ffe934ae5d0185a3250a68fdce743b2d41","abstract_canon_sha256":"8ff1de8c18d0aacd9400af4ea8c6fee487eb531543513e71c86774db634927c9"},"schema_version":"1.0"},"canonical_sha256":"6b39529b1b7ba2ab74089719446222995c341549a437f99763ce559d0a4365be","source":{"kind":"arxiv","id":"0902.1479","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.1479","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"arxiv_version","alias_value":"0902.1479v2","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.1479","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"pith_short_12","alias_value":"NM4VFGY3PORK","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NM4VFGY3PORKW5AI","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NM4VFGY3","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:NM4VFGY3PORKW5AIS4MUIYRCTF","target":"record","payload":{"canonical_record":{"source":{"id":"0902.1479","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-02-09T17:16:34Z","cross_cats_sorted":[],"title_canon_sha256":"b19bfb473e72e8d4a8c6e8d8c02bc8ffe934ae5d0185a3250a68fdce743b2d41","abstract_canon_sha256":"8ff1de8c18d0aacd9400af4ea8c6fee487eb531543513e71c86774db634927c9"},"schema_version":"1.0"},"canonical_sha256":"6b39529b1b7ba2ab74089719446222995c341549a437f99763ce559d0a4365be","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:48.683151Z","signature_b64":"hUenbAscuzpQ4Pu0JK0B4Gmr9YH+L+QqVl0aPrc5SdyNAe3aldM0UzEV0llsuh5WubfoXkCkOldLqiJiSOLjBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6b39529b1b7ba2ab74089719446222995c341549a437f99763ce559d0a4365be","last_reissued_at":"2026-05-18T02:14:48.682542Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:48.682542Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0902.1479","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":"2026-05-18T02:14:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b0BLeUVN9+YMew9a6OZ5+c4CM8csz5TX8446TaieWDofeUa+T9chb7ZbA8CU3cpXfAsXUF7uR4ri++na+QtqAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:03:28.635644Z"},"content_sha256":"cfac4b7c01e3e9fb61e37c29f08f2857c5484965fc05b6a00a8a7436e5bc6d5f","schema_version":"1.0","event_id":"sha256:cfac4b7c01e3e9fb61e37c29f08f2857c5484965fc05b6a00a8a7436e5bc6d5f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:NM4VFGY3PORKW5AIS4MUIYRCTF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The role of contacts in graphene transistors: A scanning photocurrent study","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"F. Xia, J. Tsang, M. Freitag, Ph. Avouris, T. Mueller","submitted_at":"2009-02-09T17:16:34Z","abstract_excerpt":"A near-field scanning optical microscope is used to locally induce photocurrent in a graphene transistor with high spatial resolution. By analyzing the spatially resolved photo-response, we find that in the n-type conduction regime a p-n-p structure forms along the graphene device due to the doping of the graphene by the metal contacts. The modification of the electronic structure is not limited only underneath the metal electrodes, but extends 0.2-0.3 um into the graphene channel. The asymmetric conduction behavior of electrons and holes that is commonly observed in graphene transistors is di"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.1479","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":"2026-05-18T02:14:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"y4nyZRlJhrxU/rzBSj9miD9gDsyQAvQkP6MYJHoXle86D+OAHZI+3MKF/9fITRucup5hZRCR+T/ijStomsQJCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T06:03:28.635989Z"},"content_sha256":"9cf5794d7a581c63386a87cda5f5817036db587307658d2d2c661bbbeedb9678","schema_version":"1.0","event_id":"sha256:9cf5794d7a581c63386a87cda5f5817036db587307658d2d2c661bbbeedb9678"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/bundle.json","state_url":"https://pith.science/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/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":"2026-06-04T06:03:28Z","links":{"resolver":"https://pith.science/pith/NM4VFGY3PORKW5AIS4MUIYRCTF","bundle":"https://pith.science/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/bundle.json","state":"https://pith.science/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NM4VFGY3PORKW5AIS4MUIYRCTF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:NM4VFGY3PORKW5AIS4MUIYRCTF","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":"8ff1de8c18d0aacd9400af4ea8c6fee487eb531543513e71c86774db634927c9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-02-09T17:16:34Z","title_canon_sha256":"b19bfb473e72e8d4a8c6e8d8c02bc8ffe934ae5d0185a3250a68fdce743b2d41"},"schema_version":"1.0","source":{"id":"0902.1479","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0902.1479","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"arxiv_version","alias_value":"0902.1479v2","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0902.1479","created_at":"2026-05-18T02:14:48Z"},{"alias_kind":"pith_short_12","alias_value":"NM4VFGY3PORK","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NM4VFGY3PORKW5AI","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NM4VFGY3","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:9cf5794d7a581c63386a87cda5f5817036db587307658d2d2c661bbbeedb9678","target":"graph","created_at":"2026-05-18T02:14:48Z","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":"A near-field scanning optical microscope is used to locally induce photocurrent in a graphene transistor with high spatial resolution. By analyzing the spatially resolved photo-response, we find that in the n-type conduction regime a p-n-p structure forms along the graphene device due to the doping of the graphene by the metal contacts. The modification of the electronic structure is not limited only underneath the metal electrodes, but extends 0.2-0.3 um into the graphene channel. The asymmetric conduction behavior of electrons and holes that is commonly observed in graphene transistors is di","authors_text":"F. Xia, J. Tsang, M. Freitag, Ph. Avouris, T. Mueller","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-02-09T17:16:34Z","title":"The role of contacts in graphene transistors: A scanning photocurrent study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0902.1479","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:cfac4b7c01e3e9fb61e37c29f08f2857c5484965fc05b6a00a8a7436e5bc6d5f","target":"record","created_at":"2026-05-18T02:14:48Z","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":"8ff1de8c18d0aacd9400af4ea8c6fee487eb531543513e71c86774db634927c9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2009-02-09T17:16:34Z","title_canon_sha256":"b19bfb473e72e8d4a8c6e8d8c02bc8ffe934ae5d0185a3250a68fdce743b2d41"},"schema_version":"1.0","source":{"id":"0902.1479","kind":"arxiv","version":2}},"canonical_sha256":"6b39529b1b7ba2ab74089719446222995c341549a437f99763ce559d0a4365be","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6b39529b1b7ba2ab74089719446222995c341549a437f99763ce559d0a4365be","first_computed_at":"2026-05-18T02:14:48.682542Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:48.682542Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hUenbAscuzpQ4Pu0JK0B4Gmr9YH+L+QqVl0aPrc5SdyNAe3aldM0UzEV0llsuh5WubfoXkCkOldLqiJiSOLjBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:48.683151Z","signed_message":"canonical_sha256_bytes"},"source_id":"0902.1479","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cfac4b7c01e3e9fb61e37c29f08f2857c5484965fc05b6a00a8a7436e5bc6d5f","sha256:9cf5794d7a581c63386a87cda5f5817036db587307658d2d2c661bbbeedb9678"],"state_sha256":"bad5038ac0f587ab5d4f746400533d0a3635682caed93830b0d10f8e4a7e19b7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VAtyg4W7EXaRo0v9Pvyft+xy6Jov6KfvDUF40ZnQ+uv8jUFqokyetgeGJq1U9twd8ZIsW+KUql39KVsyOSL3Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T06:03:28.637897Z","bundle_sha256":"e2ff494ed27498e11ccddb627709c1cadacf035ea5fe428a487d495cbea681eb"}}