{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:YEQ5HOLSJIMLLJPKOK7PJZH7JW","short_pith_number":"pith:YEQ5HOLS","canonical_record":{"source":{"id":"1510.06512","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-22T08:06:03Z","cross_cats_sorted":[],"title_canon_sha256":"cf2af9b120049007f50c4c9118ab7da81423d74ed70463bd8f8abf82b2175f77","abstract_canon_sha256":"b1bb1b9d929201241e4b11f3b257b12c041c1179a0f14b3d7e8ef00f8aea8510"},"schema_version":"1.0"},"canonical_sha256":"c121d3b9724a18b5a5ea72bef4e4ff4db570154fb81ce7eed60036556a5dfe19","source":{"kind":"arxiv","id":"1510.06512","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06512","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06512v1","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06512","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"YEQ5HOLSJIML","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"YEQ5HOLSJIMLLJPK","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"YEQ5HOLS","created_at":"2026-05-18T12:29:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:YEQ5HOLSJIMLLJPKOK7PJZH7JW","target":"record","payload":{"canonical_record":{"source":{"id":"1510.06512","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-22T08:06:03Z","cross_cats_sorted":[],"title_canon_sha256":"cf2af9b120049007f50c4c9118ab7da81423d74ed70463bd8f8abf82b2175f77","abstract_canon_sha256":"b1bb1b9d929201241e4b11f3b257b12c041c1179a0f14b3d7e8ef00f8aea8510"},"schema_version":"1.0"},"canonical_sha256":"c121d3b9724a18b5a5ea72bef4e4ff4db570154fb81ce7eed60036556a5dfe19","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:03:20.198803Z","signature_b64":"a1id11HSTcXPjuIp21QZcmcabtZ6wmgpYeZzLZNM5dkmtnMzSrG84HmQhOu1CDPMnDj/+pnSMhpicLSMccYMAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c121d3b9724a18b5a5ea72bef4e4ff4db570154fb81ce7eed60036556a5dfe19","last_reissued_at":"2026-05-18T01:03:20.198257Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:03:20.198257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.06512","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":"2026-05-18T01:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OxW0WB/tPYl4Y0sduYuFNAM4X7eYHqFwOvy7ej24Ydqiw8GuGyu+A5I00PJbwm8qAKB3agY1u5UDLdhKSgcmCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T04:28:47.093063Z"},"content_sha256":"74f92633058aafdfafa792f424e0e68a0484dc61e433265d39be3073a923cdea","schema_version":"1.0","event_id":"sha256:74f92633058aafdfafa792f424e0e68a0484dc61e433265d39be3073a923cdea"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:YEQ5HOLSJIMLLJPKOK7PJZH7JW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comparison of the luminous efficiency of Ga- and N-polar In$_{x}$Ga$_{1-x}$N/In$_{y}$Ga$_{1-y}$N quantum wells grown by plasma-assisted molecular beam epitaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Caroline Ch\\`eze, Christian Hauswald, Czes{\\l}aw Skierbiszewski, Jonas L\\\"ahnemann, Martin Albrecht, Maxim Korytov, Oliver Brandt, Sergio Fern\\'andez-Garrido","submitted_at":"2015-10-22T08:06:03Z","abstract_excerpt":"We investigate the luminescence of Ga- and N-polar In$_{x}$Ga$_{1-x}$N/In$_{y}$Ga$_{1-y}$N quantum wells (QWs) grown by plasma-assisted molecular beam epitaxy on freestanding GaN as well as 6H-SiC substrates. In striking contrast to their Ga-polar counterparts, the N-polar QWs prepared on freestanding GaN do not exhibit any detectable photoluminescence. Theoretical simulations of the band profiles combined with resonant excitation of the QWs allow us to rule out carrier escape and subsequent surface recombination as the reason for the absence of luminescence. To explore the hypothesis of a hig"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06512","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":"2026-05-18T01:03:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T9dybHQnp6XnGKSl6moSFIOysuyGikCKvj9z2doVMF3ayOlbdA2ytKmlbt98BAfSs26VbvHk9KhWujxViRnUDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T04:28:47.093705Z"},"content_sha256":"5d21c7d26a25bd1b650487374fde60659c25053b7f2ca79037188b45d748f5d2","schema_version":"1.0","event_id":"sha256:5d21c7d26a25bd1b650487374fde60659c25053b7f2ca79037188b45d748f5d2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/bundle.json","state_url":"https://pith.science/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/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":"2026-05-27T04:28:47Z","links":{"resolver":"https://pith.science/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW","bundle":"https://pith.science/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/bundle.json","state":"https://pith.science/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YEQ5HOLSJIMLLJPKOK7PJZH7JW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:YEQ5HOLSJIMLLJPKOK7PJZH7JW","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":"b1bb1b9d929201241e4b11f3b257b12c041c1179a0f14b3d7e8ef00f8aea8510","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-22T08:06:03Z","title_canon_sha256":"cf2af9b120049007f50c4c9118ab7da81423d74ed70463bd8f8abf82b2175f77"},"schema_version":"1.0","source":{"id":"1510.06512","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.06512","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"arxiv_version","alias_value":"1510.06512v1","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.06512","created_at":"2026-05-18T01:03:20Z"},{"alias_kind":"pith_short_12","alias_value":"YEQ5HOLSJIML","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_16","alias_value":"YEQ5HOLSJIMLLJPK","created_at":"2026-05-18T12:29:50Z"},{"alias_kind":"pith_short_8","alias_value":"YEQ5HOLS","created_at":"2026-05-18T12:29:50Z"}],"graph_snapshots":[{"event_id":"sha256:5d21c7d26a25bd1b650487374fde60659c25053b7f2ca79037188b45d748f5d2","target":"graph","created_at":"2026-05-18T01:03:20Z","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 investigate the luminescence of Ga- and N-polar In$_{x}$Ga$_{1-x}$N/In$_{y}$Ga$_{1-y}$N quantum wells (QWs) grown by plasma-assisted molecular beam epitaxy on freestanding GaN as well as 6H-SiC substrates. In striking contrast to their Ga-polar counterparts, the N-polar QWs prepared on freestanding GaN do not exhibit any detectable photoluminescence. Theoretical simulations of the band profiles combined with resonant excitation of the QWs allow us to rule out carrier escape and subsequent surface recombination as the reason for the absence of luminescence. To explore the hypothesis of a hig","authors_text":"Caroline Ch\\`eze, Christian Hauswald, Czes{\\l}aw Skierbiszewski, Jonas L\\\"ahnemann, Martin Albrecht, Maxim Korytov, Oliver Brandt, Sergio Fern\\'andez-Garrido","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-22T08:06:03Z","title":"Comparison of the luminous efficiency of Ga- and N-polar In$_{x}$Ga$_{1-x}$N/In$_{y}$Ga$_{1-y}$N quantum wells grown by plasma-assisted molecular beam epitaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.06512","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":"sha256:74f92633058aafdfafa792f424e0e68a0484dc61e433265d39be3073a923cdea","target":"record","created_at":"2026-05-18T01:03:20Z","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":"b1bb1b9d929201241e4b11f3b257b12c041c1179a0f14b3d7e8ef00f8aea8510","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-10-22T08:06:03Z","title_canon_sha256":"cf2af9b120049007f50c4c9118ab7da81423d74ed70463bd8f8abf82b2175f77"},"schema_version":"1.0","source":{"id":"1510.06512","kind":"arxiv","version":1}},"canonical_sha256":"c121d3b9724a18b5a5ea72bef4e4ff4db570154fb81ce7eed60036556a5dfe19","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c121d3b9724a18b5a5ea72bef4e4ff4db570154fb81ce7eed60036556a5dfe19","first_computed_at":"2026-05-18T01:03:20.198257Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:03:20.198257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a1id11HSTcXPjuIp21QZcmcabtZ6wmgpYeZzLZNM5dkmtnMzSrG84HmQhOu1CDPMnDj/+pnSMhpicLSMccYMAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:03:20.198803Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.06512","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:74f92633058aafdfafa792f424e0e68a0484dc61e433265d39be3073a923cdea","sha256:5d21c7d26a25bd1b650487374fde60659c25053b7f2ca79037188b45d748f5d2"],"state_sha256":"070287f54a534a36f2bf315ce6f8c437e3980289673a2e415a13045187366edf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tJuKMJ2QRq2bUVHSSBVoaafCvlBAy1dwFfMVXJoi39NZTZ7SAOEJc7bXb2KRAZowF0ANEbhox0Ly8WTUeZA0Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T04:28:47.097012Z","bundle_sha256":"6a28429698cea0721049068a8225de347573c7b349cc489e522b1b9273b4fca5"}}