{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:SZUYXZQV3KLL24AYT67YSSHFM3","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":"6d3aa45ee1f39414259867017a89bd87af9714ecd0d3d9c6d60c3d294b7eb504","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-06-02T17:29:33Z","title_canon_sha256":"9cc0f31e8ac8087bce147612d561fb6679084af65d104efbfec2cfa470dd1d00"},"schema_version":"1.0","source":{"id":"1406.0448","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1406.0448","created_at":"2026-05-18T02:50:40Z"},{"alias_kind":"arxiv_version","alias_value":"1406.0448v1","created_at":"2026-05-18T02:50:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1406.0448","created_at":"2026-05-18T02:50:40Z"},{"alias_kind":"pith_short_12","alias_value":"SZUYXZQV3KLL","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_16","alias_value":"SZUYXZQV3KLL24AY","created_at":"2026-05-18T12:28:49Z"},{"alias_kind":"pith_short_8","alias_value":"SZUYXZQV","created_at":"2026-05-18T12:28:49Z"}],"graph_snapshots":[{"event_id":"sha256:47195bbbd7e21d55ea36a571fc0530cc59cada559f682b5fe08228039da4b07b","target":"graph","created_at":"2026-05-18T02:50:40Z","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":"The compositional dependence of the lowest direct and indirect band gaps in $\\text{Ge}_{1-y}\\text{Sn}_{y}$ has been determined from room-temperature photoluminescence measurements. This technique is particularly attractive for a comparison of the two transitions because distinct features in the spectra can be associated with the direct and indirect gaps. However, detailed modeling of these room temperature spectra is required to extract the band gap values with the high accuracy required to determine the Sn concentration $y_{c}$ at which the alloy becomes a direct gap semiconductor. For the di","authors_text":"C.L. Senaratne, J.D. Gallagher, J. Kouvetakis, J. Mathews, J. Men\\'endez, L. Jiang, T. Aoki","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-06-02T17:29:33Z","title":"Compositional dependence of the direct and indirect band gaps in $\\text{Ge}_{1-y}\\text{Sn}_{y}$ alloys from room temperature photoluminescence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.0448","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":"sha256:0a224f99e16de658035b536e632f391b400c45c07ca3e1b887e317b1b17d1088","target":"record","created_at":"2026-05-18T02:50:40Z","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":"6d3aa45ee1f39414259867017a89bd87af9714ecd0d3d9c6d60c3d294b7eb504","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2014-06-02T17:29:33Z","title_canon_sha256":"9cc0f31e8ac8087bce147612d561fb6679084af65d104efbfec2cfa470dd1d00"},"schema_version":"1.0","source":{"id":"1406.0448","kind":"arxiv","version":1}},"canonical_sha256":"96698be615da96bd70189fbf8948e566cbfede118eaec181f794b0578919a84e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"96698be615da96bd70189fbf8948e566cbfede118eaec181f794b0578919a84e","first_computed_at":"2026-05-18T02:50:40.936771Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:50:40.936771Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qU2wmFVM53FRbm03gRtoXvaXkez/Tyl9GDSRc2BhDO+nFJ98190BhzPfCKn7iO9MLb5BJfsbWauqea9Sb47LDw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:50:40.937350Z","signed_message":"canonical_sha256_bytes"},"source_id":"1406.0448","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0a224f99e16de658035b536e632f391b400c45c07ca3e1b887e317b1b17d1088","sha256:47195bbbd7e21d55ea36a571fc0530cc59cada559f682b5fe08228039da4b07b"],"state_sha256":"08921e7ca380cb5a80f0c951c5ef46c98c0e033bab6edae1b64150fa1c53a9bd"}