{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:FT5NLQ6LYYX773ETBQIH4T2CLO","short_pith_number":"pith:FT5NLQ6L","canonical_record":{"source":{"id":"1304.0911","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-03T11:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"fe806aed865406d281f67a11b45d362f31c07c4e86029a76a7ba20c51b108e33","abstract_canon_sha256":"81ff28cf566f0f7284986259d2c3daaeaa1fbf0ce66635ced16e12be2fe466c2"},"schema_version":"1.0"},"canonical_sha256":"2cfad5c3cbc62fffec930c107e4f425b8203622777b796d636c511f16ed01a40","source":{"kind":"arxiv","id":"1304.0911","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.0911","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"arxiv_version","alias_value":"1304.0911v2","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.0911","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"pith_short_12","alias_value":"FT5NLQ6LYYX7","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"FT5NLQ6LYYX773ET","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"FT5NLQ6L","created_at":"2026-05-18T12:27:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:FT5NLQ6LYYX773ETBQIH4T2CLO","target":"record","payload":{"canonical_record":{"source":{"id":"1304.0911","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-03T11:02:58Z","cross_cats_sorted":[],"title_canon_sha256":"fe806aed865406d281f67a11b45d362f31c07c4e86029a76a7ba20c51b108e33","abstract_canon_sha256":"81ff28cf566f0f7284986259d2c3daaeaa1fbf0ce66635ced16e12be2fe466c2"},"schema_version":"1.0"},"canonical_sha256":"2cfad5c3cbc62fffec930c107e4f425b8203622777b796d636c511f16ed01a40","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:56:35.362595Z","signature_b64":"wbWyewWpYlK+Ckc068AXtyeU4QQgqe2Jx8+ho+2at7+n9WVUebGGvrbnb+DQRXvSUCU/7lss30qrYfDNmqitDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2cfad5c3cbc62fffec930c107e4f425b8203622777b796d636c511f16ed01a40","last_reissued_at":"2026-05-18T02:56:35.361881Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:56:35.361881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1304.0911","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":"2026-05-18T02:56:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+CLynq+4gQfnSEwHaGBML8ALtV3pd7sxHUqTj8x3SBX4TK6UGyGDtg6LwcdXAdmNmPILyET5SEA4xG0/964IBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T11:33:41.255559Z"},"content_sha256":"3996638f1217abf557170400b1ee569041fedba104817c2b64685ff5310ebe13","schema_version":"1.0","event_id":"sha256:3996638f1217abf557170400b1ee569041fedba104817c2b64685ff5310ebe13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:FT5NLQ6LYYX773ETBQIH4T2CLO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Lattice dynamics in mono- and few-layer sheets of WS2 and WSe2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Amara Kiran Kumar, Christian Kloc, Goki Eda, Jing Ren Pang, Minglin Toh, Ping Heng Tan, Weijie Zhao, Xin Zhang, Zohreh Ghorannevis","submitted_at":"2013-04-03T11:02:58Z","abstract_excerpt":"Thickness is one of the fundamental parameters that define the electronic, optical, and thermal properties of two-dimensional (2D) crystals. Phonons in molybdenum disulfide (MoS2) were recently found to exhibit unique thickness dependence due to interplay between short and long range interactions. Here we report Raman spectra of atomically thin sheets of WS2 and WSe2 in the mono- to few-layer thickness regime. We show that, similar to the case of MoS2, the characteristic and modes exhibit stiffening and softening with increasing number of layers, respectively, with a small shift of less than 3"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.0911","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":"2026-05-18T02:56:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/I0EMHhOvAdyBquA2qcDAdQ6Gi2hKPhtMcP09C5W6RCS6vJ4OgJ4TrgaV94XhHR0ymSTprS9jB98Dyuqy60/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T11:33:41.255914Z"},"content_sha256":"a885d8ab72aa09d2a465f4402f8678f3f844dcb8e778c08fe3f55f08195638f6","schema_version":"1.0","event_id":"sha256:a885d8ab72aa09d2a465f4402f8678f3f844dcb8e778c08fe3f55f08195638f6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/bundle.json","state_url":"https://pith.science/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/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":"2026-06-02T11:33:41Z","links":{"resolver":"https://pith.science/pith/FT5NLQ6LYYX773ETBQIH4T2CLO","bundle":"https://pith.science/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/bundle.json","state":"https://pith.science/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FT5NLQ6LYYX773ETBQIH4T2CLO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:FT5NLQ6LYYX773ETBQIH4T2CLO","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":"81ff28cf566f0f7284986259d2c3daaeaa1fbf0ce66635ced16e12be2fe466c2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-03T11:02:58Z","title_canon_sha256":"fe806aed865406d281f67a11b45d362f31c07c4e86029a76a7ba20c51b108e33"},"schema_version":"1.0","source":{"id":"1304.0911","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1304.0911","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"arxiv_version","alias_value":"1304.0911v2","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1304.0911","created_at":"2026-05-18T02:56:35Z"},{"alias_kind":"pith_short_12","alias_value":"FT5NLQ6LYYX7","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"FT5NLQ6LYYX773ET","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"FT5NLQ6L","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:a885d8ab72aa09d2a465f4402f8678f3f844dcb8e778c08fe3f55f08195638f6","target":"graph","created_at":"2026-05-18T02:56:35Z","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":"Thickness is one of the fundamental parameters that define the electronic, optical, and thermal properties of two-dimensional (2D) crystals. Phonons in molybdenum disulfide (MoS2) were recently found to exhibit unique thickness dependence due to interplay between short and long range interactions. Here we report Raman spectra of atomically thin sheets of WS2 and WSe2 in the mono- to few-layer thickness regime. We show that, similar to the case of MoS2, the characteristic and modes exhibit stiffening and softening with increasing number of layers, respectively, with a small shift of less than 3","authors_text":"Amara Kiran Kumar, Christian Kloc, Goki Eda, Jing Ren Pang, Minglin Toh, Ping Heng Tan, Weijie Zhao, Xin Zhang, Zohreh Ghorannevis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-03T11:02:58Z","title":"Lattice dynamics in mono- and few-layer sheets of WS2 and WSe2"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1304.0911","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":"sha256:3996638f1217abf557170400b1ee569041fedba104817c2b64685ff5310ebe13","target":"record","created_at":"2026-05-18T02:56:35Z","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":"81ff28cf566f0f7284986259d2c3daaeaa1fbf0ce66635ced16e12be2fe466c2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2013-04-03T11:02:58Z","title_canon_sha256":"fe806aed865406d281f67a11b45d362f31c07c4e86029a76a7ba20c51b108e33"},"schema_version":"1.0","source":{"id":"1304.0911","kind":"arxiv","version":2}},"canonical_sha256":"2cfad5c3cbc62fffec930c107e4f425b8203622777b796d636c511f16ed01a40","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2cfad5c3cbc62fffec930c107e4f425b8203622777b796d636c511f16ed01a40","first_computed_at":"2026-05-18T02:56:35.361881Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:56:35.361881Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wbWyewWpYlK+Ckc068AXtyeU4QQgqe2Jx8+ho+2at7+n9WVUebGGvrbnb+DQRXvSUCU/7lss30qrYfDNmqitDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:56:35.362595Z","signed_message":"canonical_sha256_bytes"},"source_id":"1304.0911","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3996638f1217abf557170400b1ee569041fedba104817c2b64685ff5310ebe13","sha256:a885d8ab72aa09d2a465f4402f8678f3f844dcb8e778c08fe3f55f08195638f6"],"state_sha256":"b21468a9e1c4239778d20e8f0b4f303bead0ebf28134def4a144e36998962fd4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5ISf28CcUymqs9+ihlczR4EkY6mSGO82KQFvnd5CTIsdeNzDVz0lPGL7gwkpAM0MjVIgfs2zGmioXYTAGSA5Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T11:33:41.257941Z","bundle_sha256":"095baebed1b0f368367e149929afbbb820952d199e64e2d34381139ebb6fed05"}}