{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:2SAKMLMYR5O7YHYGCM4WJWXEZB","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":"42d1b86add9bcf301d0edadc9fab58c6e8a5748e5cb23cf39179f2b5966f4418","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-03-27T18:30:09Z","title_canon_sha256":"fa886d0a8eabb7a219929417c8472f701e9a9c9b76fa51b8ac100d62d6d424ec"},"schema_version":"1.0","source":{"id":"1203.6043","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1203.6043","created_at":"2026-05-18T03:52:27Z"},{"alias_kind":"arxiv_version","alias_value":"1203.6043v3","created_at":"2026-05-18T03:52:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1203.6043","created_at":"2026-05-18T03:52:27Z"},{"alias_kind":"pith_short_12","alias_value":"2SAKMLMYR5O7","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_16","alias_value":"2SAKMLMYR5O7YHYG","created_at":"2026-05-18T12:26:50Z"},{"alias_kind":"pith_short_8","alias_value":"2SAKMLMY","created_at":"2026-05-18T12:26:50Z"}],"graph_snapshots":[{"event_id":"sha256:fe89037564db7cd3ebf10f3108cb33fff7c0caea44cedd29aa740cc477373da2","target":"graph","created_at":"2026-05-18T03:52:27Z","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 present a double-resonant Raman mode in few-layer graphene, which is able to probe the number of graphene layers reliably. This so-called N mode on the low-frequency side of the G mode results from a double-resonant Stokes/anti-Stokes process combining a LO and a ZO' phonon. Simulations of the double-resonant Raman spectra in bilayer graphene show very good agreement with the experiments. The investigation of the out-of-plane ZO' phonon for layer number determination is expected to be transferable to other layered materials like boron nitride.","authors_text":"Felix Herziger, Janina Maultzsch, Patrick May","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-03-27T18:30:09Z","title":"Layer number determination in graphene using out-of-plane vibrations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1203.6043","kind":"arxiv","version":3},"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:aad77226ec9792218367b488b2d43acefeab9a8d6bb6a0dacb24f3f3fe897cee","target":"record","created_at":"2026-05-18T03:52:27Z","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":"42d1b86add9bcf301d0edadc9fab58c6e8a5748e5cb23cf39179f2b5966f4418","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-03-27T18:30:09Z","title_canon_sha256":"fa886d0a8eabb7a219929417c8472f701e9a9c9b76fa51b8ac100d62d6d424ec"},"schema_version":"1.0","source":{"id":"1203.6043","kind":"arxiv","version":3}},"canonical_sha256":"d480a62d988f5dfc1f06133964dae4c8556a9dfc6c9485ad9d503ed6a7c2755e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d480a62d988f5dfc1f06133964dae4c8556a9dfc6c9485ad9d503ed6a7c2755e","first_computed_at":"2026-05-18T03:52:27.969601Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:52:27.969601Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Z4EEO31sQxpYn8zpm81WCPtTMc+k9PanmtconssK8MrQOEBO8JAafI3YAzV+NJU7u9wJ+NWGCDiX3sU6HdxBCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:52:27.970281Z","signed_message":"canonical_sha256_bytes"},"source_id":"1203.6043","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aad77226ec9792218367b488b2d43acefeab9a8d6bb6a0dacb24f3f3fe897cee","sha256:fe89037564db7cd3ebf10f3108cb33fff7c0caea44cedd29aa740cc477373da2"],"state_sha256":"894a5b2e289cc57e89895966e32ff7b971cf9ec8b302f230db13b937fabff827"}