{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:UMWOU7ES6RZSYPZPVC2DLGFV7J","short_pith_number":"pith:UMWOU7ES","canonical_record":{"source":{"id":"1206.0138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-06-01T10:15:53Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"7b916978b77e0c6d2b5e19bff90d5f9895167ca9ed92fa35d94f04483d001ae1","abstract_canon_sha256":"829f6695282439b488152d26480d33a579d227190e6ed45bd88c383f34bc9da5"},"schema_version":"1.0"},"canonical_sha256":"a32cea7c92f4732c3f2fa8b43598b5fa7dabb5d5ba67a3e2ba8ed0d885c45b0d","source":{"kind":"arxiv","id":"1206.0138","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1206.0138","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1206.0138v1","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1206.0138","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"UMWOU7ES6RZS","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"UMWOU7ES6RZSYPZP","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"UMWOU7ES","created_at":"2026-05-18T12:27:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:UMWOU7ES6RZSYPZPVC2DLGFV7J","target":"record","payload":{"canonical_record":{"source":{"id":"1206.0138","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-06-01T10:15:53Z","cross_cats_sorted":["physics.comp-ph"],"title_canon_sha256":"7b916978b77e0c6d2b5e19bff90d5f9895167ca9ed92fa35d94f04483d001ae1","abstract_canon_sha256":"829f6695282439b488152d26480d33a579d227190e6ed45bd88c383f34bc9da5"},"schema_version":"1.0"},"canonical_sha256":"a32cea7c92f4732c3f2fa8b43598b5fa7dabb5d5ba67a3e2ba8ed0d885c45b0d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:57:08.920723Z","signature_b64":"RPmZuW6Qnrmdy71EsDtJPEKhsiWd5qm8nyeQoTTXHxATVpHc+7R6w6aS0TpQr+6eW+M5HZHAiqlVV9YnQLwsDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a32cea7c92f4732c3f2fa8b43598b5fa7dabb5d5ba67a3e2ba8ed0d885c45b0d","last_reissued_at":"2026-05-18T01:57:08.920095Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:57:08.920095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1206.0138","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":"2026-05-18T01:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4vQrJWPFhrV3P2B87dZH3AClX8LLsTwttQjO0v8ue1IkKrmVR4BXOmuMtfXwhuVJp52+ekbjn3LVOJlMm/zSDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:00:57.836752Z"},"content_sha256":"0c638bccef8230f32fa5b4e6b86a0b60f12cbcd550a362b66c4ab07f7daed355","schema_version":"1.0","event_id":"sha256:0c638bccef8230f32fa5b4e6b86a0b60f12cbcd550a362b66c4ab07f7daed355"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:UMWOU7ES6RZSYPZPVC2DLGFV7J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hybrid density functional study of electronic and optical properties of phase change memory material: $\\mathrm{Ge_{2}Sb_{2}Te_{5}}$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.comp-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"1 H. L\\\"of{\\aa}s, M. Ramzan, Rajeev Ahuja, T. Kaewmaraya","submitted_at":"2012-06-01T10:15:53Z","abstract_excerpt":"In this article, we use hybrid density functional (HSE06) to study the crystal and electronic structures and optical properties of well known phase change memory material $\\mathrm{Ge_{2}Sb_{2}Te_{5}}$. We calculate the structural parameters, band gaps and dielectric functions of three stable structures of this material. We also analyze the electron charge distribution using the Bader's theory of charge analysis. We find that hybrid density functional slightly overestimate the value of 'C' parameter. However, overall, our results calculated with the use of hybrid density functional (HSE06) are "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0138","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":"2026-05-18T01:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HEBIKdRRBOg5b4qko/wnyDEyVbNDV3fgRdebd3m6pLZbVUuT0vHtQbAbLWGs/Y+jvRdxMfeEiqMflne40zz6BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T04:00:57.837364Z"},"content_sha256":"43ccca33b273d78905047c550c1a744301a2e4672f32ebbe2cc92bd14c42a886","schema_version":"1.0","event_id":"sha256:43ccca33b273d78905047c550c1a744301a2e4672f32ebbe2cc92bd14c42a886"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/bundle.json","state_url":"https://pith.science/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/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":"2026-05-28T04:00:57Z","links":{"resolver":"https://pith.science/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J","bundle":"https://pith.science/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/bundle.json","state":"https://pith.science/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UMWOU7ES6RZSYPZPVC2DLGFV7J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:UMWOU7ES6RZSYPZPVC2DLGFV7J","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":"829f6695282439b488152d26480d33a579d227190e6ed45bd88c383f34bc9da5","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-06-01T10:15:53Z","title_canon_sha256":"7b916978b77e0c6d2b5e19bff90d5f9895167ca9ed92fa35d94f04483d001ae1"},"schema_version":"1.0","source":{"id":"1206.0138","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1206.0138","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1206.0138v1","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1206.0138","created_at":"2026-05-18T01:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"UMWOU7ES6RZS","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"UMWOU7ES6RZSYPZP","created_at":"2026-05-18T12:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"UMWOU7ES","created_at":"2026-05-18T12:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:43ccca33b273d78905047c550c1a744301a2e4672f32ebbe2cc92bd14c42a886","target":"graph","created_at":"2026-05-18T01:57:08Z","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":"In this article, we use hybrid density functional (HSE06) to study the crystal and electronic structures and optical properties of well known phase change memory material $\\mathrm{Ge_{2}Sb_{2}Te_{5}}$. We calculate the structural parameters, band gaps and dielectric functions of three stable structures of this material. We also analyze the electron charge distribution using the Bader's theory of charge analysis. We find that hybrid density functional slightly overestimate the value of 'C' parameter. However, overall, our results calculated with the use of hybrid density functional (HSE06) are ","authors_text":"1 H. L\\\"of{\\aa}s, M. Ramzan, Rajeev Ahuja, T. Kaewmaraya","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-06-01T10:15:53Z","title":"Hybrid density functional study of electronic and optical properties of phase change memory material: $\\mathrm{Ge_{2}Sb_{2}Te_{5}}$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1206.0138","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":"sha256:0c638bccef8230f32fa5b4e6b86a0b60f12cbcd550a362b66c4ab07f7daed355","target":"record","created_at":"2026-05-18T01:57:08Z","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":"829f6695282439b488152d26480d33a579d227190e6ed45bd88c383f34bc9da5","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2012-06-01T10:15:53Z","title_canon_sha256":"7b916978b77e0c6d2b5e19bff90d5f9895167ca9ed92fa35d94f04483d001ae1"},"schema_version":"1.0","source":{"id":"1206.0138","kind":"arxiv","version":1}},"canonical_sha256":"a32cea7c92f4732c3f2fa8b43598b5fa7dabb5d5ba67a3e2ba8ed0d885c45b0d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a32cea7c92f4732c3f2fa8b43598b5fa7dabb5d5ba67a3e2ba8ed0d885c45b0d","first_computed_at":"2026-05-18T01:57:08.920095Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:57:08.920095Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RPmZuW6Qnrmdy71EsDtJPEKhsiWd5qm8nyeQoTTXHxATVpHc+7R6w6aS0TpQr+6eW+M5HZHAiqlVV9YnQLwsDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:57:08.920723Z","signed_message":"canonical_sha256_bytes"},"source_id":"1206.0138","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0c638bccef8230f32fa5b4e6b86a0b60f12cbcd550a362b66c4ab07f7daed355","sha256:43ccca33b273d78905047c550c1a744301a2e4672f32ebbe2cc92bd14c42a886"],"state_sha256":"f1cb84834aa7fb85b28a6c44d5f89a24ce6787e8e24a75067aef56ef3a5cb466"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sUV4OTZ3EO3N/1gp7OXuD1Xj0N66tXgep60JXH440pCzJHwaRkpmbzTdL2PS+g5YZQqWOHS5wHqWTp9ES8JmCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T04:00:57.840166Z","bundle_sha256":"0bf676559a62f7051b4dc0f061ac34b642c4b54ff0b90c14d4ea7c21c68fb2c4"}}