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For the monolayer MoS$_2$, we obtain ultrafast exciton formation times on the sub-picosecond time scale at c"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1607.04856","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-07-17T11:29:34Z","cross_cats_sorted":[],"title_canon_sha256":"a31804296bc55905beac2837ce40c91b6de4fd79416db3148248f25bd9a0a877","abstract_canon_sha256":"e4c57a7735bb04dcd6fef8b75a70121ddd744a66780a43ab13997be3aa43e510"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:02:37.905498Z","signature_b64":"K2ufqXd6ztYKvl9nOUBfYCHykPeqqb/iVHTFXK/ABVkCuE+2bsoY06Zp7Md9Fnga++PS4pUsLVrF3Cx0qgCfAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9b436e54c25b6ec242710c677e4cd0c5bdc1017688ab03d72367e0777d649a2c","last_reissued_at":"2026-05-18T01:02:37.904789Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:02:37.904789Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Exciton formation assisted by longitudinal optical phonons in monolayer transition metal dichalcogenides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"A. 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