{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:XMN6C3V3XRRMIPDPXSYW53BR6H","short_pith_number":"pith:XMN6C3V3","canonical_record":{"source":{"id":"1604.02004","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-04-07T14:04:24Z","cross_cats_sorted":[],"title_canon_sha256":"09bd8c66263f50ff5868943abd1c45feb13d177b8cdbbfa82e50d46413ea2ee1","abstract_canon_sha256":"5e461a6f09d8e3694b45b428b63faf28f8059024e19112bb0bb728c8c352ba47"},"schema_version":"1.0"},"canonical_sha256":"bb1be16ebbbc62c43c6fbcb16eec31f1c6e2283ad393e99ad6de3a196345fef4","source":{"kind":"arxiv","id":"1604.02004","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.02004","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"arxiv_version","alias_value":"1604.02004v1","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.02004","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"pith_short_12","alias_value":"XMN6C3V3XRRM","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_16","alias_value":"XMN6C3V3XRRMIPDP","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_8","alias_value":"XMN6C3V3","created_at":"2026-05-18T12:30:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:XMN6C3V3XRRMIPDPXSYW53BR6H","target":"record","payload":{"canonical_record":{"source":{"id":"1604.02004","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-04-07T14:04:24Z","cross_cats_sorted":[],"title_canon_sha256":"09bd8c66263f50ff5868943abd1c45feb13d177b8cdbbfa82e50d46413ea2ee1","abstract_canon_sha256":"5e461a6f09d8e3694b45b428b63faf28f8059024e19112bb0bb728c8c352ba47"},"schema_version":"1.0"},"canonical_sha256":"bb1be16ebbbc62c43c6fbcb16eec31f1c6e2283ad393e99ad6de3a196345fef4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:17:16.563568Z","signature_b64":"90e2OpjRxpffWiaMVy7tAwMqYuoU1DtjblywBD1Ys7FCgehJuEGZ2RudoEU9BxY1yFjjFl/hwI87RTqcjYLFAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bb1be16ebbbc62c43c6fbcb16eec31f1c6e2283ad393e99ad6de3a196345fef4","last_reissued_at":"2026-05-18T01:17:16.563017Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:17:16.563017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.02004","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":"2026-05-18T01:17:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oDEGqpcNJ1sKVZgnE0HmN5BIz8/yYk0wMNo38Nv3XnGlcs5WINX+5hbbdkW/3P6nMvxFjds7pifyhPfvkbibBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T14:35:18.862241Z"},"content_sha256":"bc5c45980b5e1bca4d9a40e60f6b6231306290a49eaf2a1373816c996fc08756","schema_version":"1.0","event_id":"sha256:bc5c45980b5e1bca4d9a40e60f6b6231306290a49eaf2a1373816c996fc08756"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:XMN6C3V3XRRMIPDPXSYW53BR6H","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First-principles analysis of the intermediate band in CuGa$_{1-x}$Fe$_x$S$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"J. Hashemi, J. Koskelo, M. Hakala, S. Huotari","submitted_at":"2016-04-07T14:04:24Z","abstract_excerpt":"We present a comprehensive study of the electronic, magnetic, and optical properties of CuGa$_{1-x}$Fe$_x$S$_2$, as a promising candidate for intermediate-band (IB) solar cells. We use hybrid exchange-correlation functional within the density functional theory framework, and show that Fe doping induces unoccupied states 1.6-1.9 eV above the valence band. The IBs significantly enhance the optical absorption in lower energy part of the spectrum. We find that at moderate $n$-type co-doping concentration, the added charge occupies part of the IB in the gap, but large concentrations lower the energ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.02004","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":"2026-05-18T01:17:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dOhhoVGzKH0qGbFHfDbYc5xWduSgOlPcYggWL3EjrE5vCcVM5zqLkWMXSEXrUkjDgVsBFpHgi/Zhq5hroAIZDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T14:35:18.862629Z"},"content_sha256":"0ed15334be8217edf5d16abeb68f43afa01700a39ac46740431b5eb7c79c0fd5","schema_version":"1.0","event_id":"sha256:0ed15334be8217edf5d16abeb68f43afa01700a39ac46740431b5eb7c79c0fd5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/bundle.json","state_url":"https://pith.science/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/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":"2026-06-09T14:35:18Z","links":{"resolver":"https://pith.science/pith/XMN6C3V3XRRMIPDPXSYW53BR6H","bundle":"https://pith.science/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/bundle.json","state":"https://pith.science/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XMN6C3V3XRRMIPDPXSYW53BR6H/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:XMN6C3V3XRRMIPDPXSYW53BR6H","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":"5e461a6f09d8e3694b45b428b63faf28f8059024e19112bb0bb728c8c352ba47","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-04-07T14:04:24Z","title_canon_sha256":"09bd8c66263f50ff5868943abd1c45feb13d177b8cdbbfa82e50d46413ea2ee1"},"schema_version":"1.0","source":{"id":"1604.02004","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.02004","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"arxiv_version","alias_value":"1604.02004v1","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.02004","created_at":"2026-05-18T01:17:16Z"},{"alias_kind":"pith_short_12","alias_value":"XMN6C3V3XRRM","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_16","alias_value":"XMN6C3V3XRRMIPDP","created_at":"2026-05-18T12:30:51Z"},{"alias_kind":"pith_short_8","alias_value":"XMN6C3V3","created_at":"2026-05-18T12:30:51Z"}],"graph_snapshots":[{"event_id":"sha256:0ed15334be8217edf5d16abeb68f43afa01700a39ac46740431b5eb7c79c0fd5","target":"graph","created_at":"2026-05-18T01:17:16Z","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 present a comprehensive study of the electronic, magnetic, and optical properties of CuGa$_{1-x}$Fe$_x$S$_2$, as a promising candidate for intermediate-band (IB) solar cells. We use hybrid exchange-correlation functional within the density functional theory framework, and show that Fe doping induces unoccupied states 1.6-1.9 eV above the valence band. The IBs significantly enhance the optical absorption in lower energy part of the spectrum. We find that at moderate $n$-type co-doping concentration, the added charge occupies part of the IB in the gap, but large concentrations lower the energ","authors_text":"J. Hashemi, J. Koskelo, M. Hakala, S. Huotari","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-04-07T14:04:24Z","title":"First-principles analysis of the intermediate band in CuGa$_{1-x}$Fe$_x$S$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.02004","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:bc5c45980b5e1bca4d9a40e60f6b6231306290a49eaf2a1373816c996fc08756","target":"record","created_at":"2026-05-18T01:17:16Z","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":"5e461a6f09d8e3694b45b428b63faf28f8059024e19112bb0bb728c8c352ba47","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-04-07T14:04:24Z","title_canon_sha256":"09bd8c66263f50ff5868943abd1c45feb13d177b8cdbbfa82e50d46413ea2ee1"},"schema_version":"1.0","source":{"id":"1604.02004","kind":"arxiv","version":1}},"canonical_sha256":"bb1be16ebbbc62c43c6fbcb16eec31f1c6e2283ad393e99ad6de3a196345fef4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bb1be16ebbbc62c43c6fbcb16eec31f1c6e2283ad393e99ad6de3a196345fef4","first_computed_at":"2026-05-18T01:17:16.563017Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:17:16.563017Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"90e2OpjRxpffWiaMVy7tAwMqYuoU1DtjblywBD1Ys7FCgehJuEGZ2RudoEU9BxY1yFjjFl/hwI87RTqcjYLFAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:17:16.563568Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.02004","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bc5c45980b5e1bca4d9a40e60f6b6231306290a49eaf2a1373816c996fc08756","sha256:0ed15334be8217edf5d16abeb68f43afa01700a39ac46740431b5eb7c79c0fd5"],"state_sha256":"4b4178fe135a9cca8abe8247bd4f4d50ee69dfafc2a0f5d72da1c862ee9b8617"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FqhxoOkbAJAROSw6STB0NnPDU0jqmkeU/vdLtnZaxRZD7HVdW6TL4HWiFcI6xAxsJuDPcWdE1EQSHs4Lq4fNDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T14:35:18.865526Z","bundle_sha256":"72c9d1193494cc9d1824b4da7bbff17c30b0bc0aac0fd96881419f2fd951f234"}}