{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:CBEF4HX5MEYSENQERF55XEUDOC","short_pith_number":"pith:CBEF4HX5","canonical_record":{"source":{"id":"1503.08980","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-03-31T09:39:05Z","cross_cats_sorted":[],"title_canon_sha256":"6bf79f89ba40850722f1f26d35a68ee5e6907b11eaee9d667464223eb7c84b3d","abstract_canon_sha256":"8401ca39f3d67105a8158c06e1d4f67615e7c93248da7051ff23b94397a6b5ed"},"schema_version":"1.0"},"canonical_sha256":"10485e1efd6131223604897bdb9283708ed008e046bb6c37942a1603c432ae25","source":{"kind":"arxiv","id":"1503.08980","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.08980","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"arxiv_version","alias_value":"1503.08980v1","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.08980","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"pith_short_12","alias_value":"CBEF4HX5MEYS","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"CBEF4HX5MEYSENQE","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"CBEF4HX5","created_at":"2026-05-18T12:29:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:CBEF4HX5MEYSENQERF55XEUDOC","target":"record","payload":{"canonical_record":{"source":{"id":"1503.08980","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-03-31T09:39:05Z","cross_cats_sorted":[],"title_canon_sha256":"6bf79f89ba40850722f1f26d35a68ee5e6907b11eaee9d667464223eb7c84b3d","abstract_canon_sha256":"8401ca39f3d67105a8158c06e1d4f67615e7c93248da7051ff23b94397a6b5ed"},"schema_version":"1.0"},"canonical_sha256":"10485e1efd6131223604897bdb9283708ed008e046bb6c37942a1603c432ae25","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:06.252155Z","signature_b64":"hVuJghmtm8E27tA8vMyIPSzU+OEHMUgLmV/25+z5ZiO+t5Ya/GcGru+2AmS/ozbcKTYKBB/OfKc3wHGma8CmCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10485e1efd6131223604897bdb9283708ed008e046bb6c37942a1603c432ae25","last_reissued_at":"2026-05-18T01:48:06.251541Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:06.251541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1503.08980","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":"2026-05-18T01:48:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CJRlPelG6yupApB7sIsjvtIzrUIREYJ/HaKswP9pJDzJ1hqI2We4YTXXziNtmOEZ4fPwq+9APqq9fyFXqzqpBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:40:47.247686Z"},"content_sha256":"b9888c7a327c787a37d0f6dad45eba8b8e12a102bcbbdda22a382b8a251c48b0","schema_version":"1.0","event_id":"sha256:b9888c7a327c787a37d0f6dad45eba8b8e12a102bcbbdda22a382b8a251c48b0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:CBEF4HX5MEYSENQERF55XEUDOC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Newly observed first-order resonant Raman modes in few-layer MoS$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Janina Maultzsch, Matthias Staiger, Nils Scheuschner, Roland Gillen","submitted_at":"2015-03-31T09:39:05Z","abstract_excerpt":"We report two new first-order Raman modes in the spectra of few-layer MoS$_2$ at 286~cm$^{-1}$ and 471~cm$^{-1}$ for excitation energies above 2.4~eV. These modes appear only in few-layer MoS$_2$; therefore their absence provides an easy and accurate method to identify single-layer MoS$_2$. We show that these modes are related to phonons that are not observed in the single layer due to their symmetry. Each of these phonons leads to several nearly degenerate phonons in few-layer samples. The nearly degenerate phonons in few-layer materials belong to two different symmetry representations, showi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.08980","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":"2026-05-18T01:48:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r8HE8OclW5uhIebEi7R5lBI68GecbuQfjjCqUePffzeUM2xIgSsSiRqa8+7yXeCgDcAfpDU7TBdKbXzajMWeAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T16:40:47.248388Z"},"content_sha256":"ace98caedc6663eb66b79a4625c1766d933d5ca2f3d28bcad8ae523f1e1f618c","schema_version":"1.0","event_id":"sha256:ace98caedc6663eb66b79a4625c1766d933d5ca2f3d28bcad8ae523f1e1f618c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CBEF4HX5MEYSENQERF55XEUDOC/bundle.json","state_url":"https://pith.science/pith/CBEF4HX5MEYSENQERF55XEUDOC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CBEF4HX5MEYSENQERF55XEUDOC/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":"2026-05-25T16:40:47Z","links":{"resolver":"https://pith.science/pith/CBEF4HX5MEYSENQERF55XEUDOC","bundle":"https://pith.science/pith/CBEF4HX5MEYSENQERF55XEUDOC/bundle.json","state":"https://pith.science/pith/CBEF4HX5MEYSENQERF55XEUDOC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CBEF4HX5MEYSENQERF55XEUDOC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:CBEF4HX5MEYSENQERF55XEUDOC","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":"8401ca39f3d67105a8158c06e1d4f67615e7c93248da7051ff23b94397a6b5ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-03-31T09:39:05Z","title_canon_sha256":"6bf79f89ba40850722f1f26d35a68ee5e6907b11eaee9d667464223eb7c84b3d"},"schema_version":"1.0","source":{"id":"1503.08980","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.08980","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"arxiv_version","alias_value":"1503.08980v1","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.08980","created_at":"2026-05-18T01:48:06Z"},{"alias_kind":"pith_short_12","alias_value":"CBEF4HX5MEYS","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_16","alias_value":"CBEF4HX5MEYSENQE","created_at":"2026-05-18T12:29:14Z"},{"alias_kind":"pith_short_8","alias_value":"CBEF4HX5","created_at":"2026-05-18T12:29:14Z"}],"graph_snapshots":[{"event_id":"sha256:ace98caedc6663eb66b79a4625c1766d933d5ca2f3d28bcad8ae523f1e1f618c","target":"graph","created_at":"2026-05-18T01:48:06Z","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 report two new first-order Raman modes in the spectra of few-layer MoS$_2$ at 286~cm$^{-1}$ and 471~cm$^{-1}$ for excitation energies above 2.4~eV. These modes appear only in few-layer MoS$_2$; therefore their absence provides an easy and accurate method to identify single-layer MoS$_2$. We show that these modes are related to phonons that are not observed in the single layer due to their symmetry. Each of these phonons leads to several nearly degenerate phonons in few-layer samples. The nearly degenerate phonons in few-layer materials belong to two different symmetry representations, showi","authors_text":"Janina Maultzsch, Matthias Staiger, Nils Scheuschner, Roland Gillen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-03-31T09:39:05Z","title":"Newly observed first-order resonant Raman modes in few-layer MoS$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.08980","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:b9888c7a327c787a37d0f6dad45eba8b8e12a102bcbbdda22a382b8a251c48b0","target":"record","created_at":"2026-05-18T01:48:06Z","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":"8401ca39f3d67105a8158c06e1d4f67615e7c93248da7051ff23b94397a6b5ed","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-03-31T09:39:05Z","title_canon_sha256":"6bf79f89ba40850722f1f26d35a68ee5e6907b11eaee9d667464223eb7c84b3d"},"schema_version":"1.0","source":{"id":"1503.08980","kind":"arxiv","version":1}},"canonical_sha256":"10485e1efd6131223604897bdb9283708ed008e046bb6c37942a1603c432ae25","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"10485e1efd6131223604897bdb9283708ed008e046bb6c37942a1603c432ae25","first_computed_at":"2026-05-18T01:48:06.251541Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:06.251541Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hVuJghmtm8E27tA8vMyIPSzU+OEHMUgLmV/25+z5ZiO+t5Ya/GcGru+2AmS/ozbcKTYKBB/OfKc3wHGma8CmCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:06.252155Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.08980","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9888c7a327c787a37d0f6dad45eba8b8e12a102bcbbdda22a382b8a251c48b0","sha256:ace98caedc6663eb66b79a4625c1766d933d5ca2f3d28bcad8ae523f1e1f618c"],"state_sha256":"7559f85667f0742bdb3a4f0c0777061fb905c1fb430e357ea6485a2bb8fc673c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0P/2DJQ4PU5rHHTPhZoLeUO2R1rFWvfXMaWc0vJbzT75R1MSujzQeXO+Hhp0DO+Mru8azw3KXXsv+Ly945yoAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T16:40:47.251769Z","bundle_sha256":"eb649337819e1939f8e22ef828af33b0b6d27b1daac513b6896f92e2abca9a04"}}