{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:RMUXAGQXK6XIRI5GLKZCV3TQRJ","short_pith_number":"pith:RMUXAGQX","canonical_record":{"source":{"id":"1407.6997","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-07-25T18:15:37Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"cd881381db70104c07be2936b6fcc26ad2c6a9f986f7b68d75a47d2e7da991c0","abstract_canon_sha256":"c3903516312b0708153f61ca4b014339e295a92ae6cec554138e97b2e73ff224"},"schema_version":"1.0"},"canonical_sha256":"8b29701a1757ae88a3a65ab22aee708a405aea078061f1b6d9d296aab592a7d8","source":{"kind":"arxiv","id":"1407.6997","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.6997","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"arxiv_version","alias_value":"1407.6997v1","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.6997","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"pith_short_12","alias_value":"RMUXAGQXK6XI","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"RMUXAGQXK6XIRI5G","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"RMUXAGQX","created_at":"2026-05-18T12:28:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:RMUXAGQXK6XIRI5GLKZCV3TQRJ","target":"record","payload":{"canonical_record":{"source":{"id":"1407.6997","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-07-25T18:15:37Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"cd881381db70104c07be2936b6fcc26ad2c6a9f986f7b68d75a47d2e7da991c0","abstract_canon_sha256":"c3903516312b0708153f61ca4b014339e295a92ae6cec554138e97b2e73ff224"},"schema_version":"1.0"},"canonical_sha256":"8b29701a1757ae88a3a65ab22aee708a405aea078061f1b6d9d296aab592a7d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:29.892761Z","signature_b64":"0VWx6Xq2oGcC/nqYPvtL7VupkTXKKocA2WYBG559SPV68K6zm/dpfkUYbwwH9LX7AJkl2VhiBRQRR9dW4VnuAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8b29701a1757ae88a3a65ab22aee708a405aea078061f1b6d9d296aab592a7d8","last_reissued_at":"2026-05-18T01:42:29.892098Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:29.892098Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1407.6997","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":"2026-05-18T01:42:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3yf3PMtSD4V11woF7oEcKN4C67qseI1yjnQfyfL8uvmVwTyeKtbsyQzk4Crueao87rt9+SKECBLLTE+KIy2RAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:32:51.975736Z"},"content_sha256":"1f7cf393d340010ead12f6183b0c1f6ed5f4ea9f28d2210809b41bd8c20a5b3e","schema_version":"1.0","event_id":"sha256:1f7cf393d340010ead12f6183b0c1f6ed5f4ea9f28d2210809b41bd8c20a5b3e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:RMUXAGQXK6XIRI5GLKZCV3TQRJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Broad Band Optical Properties of Large Area Monolayer CVD Molybdenum Disulfide","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"A. Glen Birdwell, Curt A. Richter, David J. Gundlach, Jing Kong, Lianmao Peng, Matin Amani, N. V. Nguyen, Robert A. Burke, Wei Li, Xi Ling, Xuelei Liang, Yi-Hsien Lee","submitted_at":"2014-07-25T18:15:37Z","abstract_excerpt":"Recently emerging large-area single-layer MoS2 grown by chemical vapor deposition has triggered great interest due to its exciting potential for applications in advanced electronic and optoelectronic devices. Unlike gapless graphene, MoS2 has an intrinsic band gap in the visible which crosses over from an indirect to a direct gap when reduced to a single atomic layer. In this article, we report a comprehensive study of fundamental optical properties of MoS2 revealed by optical spectroscopy of Raman, photoluminescence, and vacuum ultraviolet spectroscopic ellipsometry. A band gap of 1.42 eV is "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.6997","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":"2026-05-18T01:42:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"elQAmjEvuNl+8pc6J3UcxMaW7vQ2aEPe64fT+FUD/TpNKDqPokQkatDV7u5Xj88Hh7VzyUSxw5EDEW8BbdR7Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T23:32:51.976451Z"},"content_sha256":"c5cde2b60bd2189c6b9c3bbbebf03c5f77197873f6183faa9da7faeea0d559ce","schema_version":"1.0","event_id":"sha256:c5cde2b60bd2189c6b9c3bbbebf03c5f77197873f6183faa9da7faeea0d559ce"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/bundle.json","state_url":"https://pith.science/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/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":"2026-05-31T23:32:51Z","links":{"resolver":"https://pith.science/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ","bundle":"https://pith.science/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/bundle.json","state":"https://pith.science/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RMUXAGQXK6XIRI5GLKZCV3TQRJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:RMUXAGQXK6XIRI5GLKZCV3TQRJ","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":"c3903516312b0708153f61ca4b014339e295a92ae6cec554138e97b2e73ff224","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-07-25T18:15:37Z","title_canon_sha256":"cd881381db70104c07be2936b6fcc26ad2c6a9f986f7b68d75a47d2e7da991c0"},"schema_version":"1.0","source":{"id":"1407.6997","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.6997","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"arxiv_version","alias_value":"1407.6997v1","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.6997","created_at":"2026-05-18T01:42:29Z"},{"alias_kind":"pith_short_12","alias_value":"RMUXAGQXK6XI","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_16","alias_value":"RMUXAGQXK6XIRI5G","created_at":"2026-05-18T12:28:46Z"},{"alias_kind":"pith_short_8","alias_value":"RMUXAGQX","created_at":"2026-05-18T12:28:46Z"}],"graph_snapshots":[{"event_id":"sha256:c5cde2b60bd2189c6b9c3bbbebf03c5f77197873f6183faa9da7faeea0d559ce","target":"graph","created_at":"2026-05-18T01:42:29Z","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":"Recently emerging large-area single-layer MoS2 grown by chemical vapor deposition has triggered great interest due to its exciting potential for applications in advanced electronic and optoelectronic devices. Unlike gapless graphene, MoS2 has an intrinsic band gap in the visible which crosses over from an indirect to a direct gap when reduced to a single atomic layer. In this article, we report a comprehensive study of fundamental optical properties of MoS2 revealed by optical spectroscopy of Raman, photoluminescence, and vacuum ultraviolet spectroscopic ellipsometry. A band gap of 1.42 eV is ","authors_text":"A. Glen Birdwell, Curt A. Richter, David J. Gundlach, Jing Kong, Lianmao Peng, Matin Amani, N. V. Nguyen, Robert A. Burke, Wei Li, Xi Ling, Xuelei Liang, Yi-Hsien Lee","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-07-25T18:15:37Z","title":"Broad Band Optical Properties of Large Area Monolayer CVD Molybdenum Disulfide"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.6997","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":"sha256:1f7cf393d340010ead12f6183b0c1f6ed5f4ea9f28d2210809b41bd8c20a5b3e","target":"record","created_at":"2026-05-18T01:42:29Z","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":"c3903516312b0708153f61ca4b014339e295a92ae6cec554138e97b2e73ff224","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2014-07-25T18:15:37Z","title_canon_sha256":"cd881381db70104c07be2936b6fcc26ad2c6a9f986f7b68d75a47d2e7da991c0"},"schema_version":"1.0","source":{"id":"1407.6997","kind":"arxiv","version":1}},"canonical_sha256":"8b29701a1757ae88a3a65ab22aee708a405aea078061f1b6d9d296aab592a7d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8b29701a1757ae88a3a65ab22aee708a405aea078061f1b6d9d296aab592a7d8","first_computed_at":"2026-05-18T01:42:29.892098Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:29.892098Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0VWx6Xq2oGcC/nqYPvtL7VupkTXKKocA2WYBG559SPV68K6zm/dpfkUYbwwH9LX7AJkl2VhiBRQRR9dW4VnuAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:29.892761Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.6997","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1f7cf393d340010ead12f6183b0c1f6ed5f4ea9f28d2210809b41bd8c20a5b3e","sha256:c5cde2b60bd2189c6b9c3bbbebf03c5f77197873f6183faa9da7faeea0d559ce"],"state_sha256":"d638a37d4f5bf436e5e61ea8a169ae4da2b777f3dc784481e9257cceee195e5a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7os2CdSoWoCPlqWO51KZtebf0daL/tIZ751z75DQFMMEf7cEjKqjbJ79V2bIl9rk1OyzXidpD3wdES/EUz57DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T23:32:51.980359Z","bundle_sha256":"388387319df8b0606f74a0ca8dc6b34b6e6fe50342ba0dd8ba0fd44e2156dc5d"}}