{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:ODSUSY6MVPUS5SMYAM3E3C2IDW","short_pith_number":"pith:ODSUSY6M","canonical_record":{"source":{"id":"1907.04146","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-07-09T13:23:39Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"8eceaa3b387ffa9685c6d78de706ffe5d6a52cee0afc4e16ceb5a3e20b1d2eb4","abstract_canon_sha256":"8d8af2dfe1177b4bfbebf640fe4d7d0eb6495d8e710c095289abe4ff4a16697f"},"schema_version":"1.0"},"canonical_sha256":"70e54963ccabe92ec99803364d8b481d941de3fca04ae3780d5172b78fe3ba50","source":{"kind":"arxiv","id":"1907.04146","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.04146","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"arxiv_version","alias_value":"1907.04146v2","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.04146","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_12","alias_value":"ODSUSY6MVPUS","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_16","alias_value":"ODSUSY6MVPUS5SMY","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_8","alias_value":"ODSUSY6M","created_at":"2026-07-05T00:51:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:ODSUSY6MVPUS5SMYAM3E3C2IDW","target":"record","payload":{"canonical_record":{"source":{"id":"1907.04146","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-07-09T13:23:39Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"8eceaa3b387ffa9685c6d78de706ffe5d6a52cee0afc4e16ceb5a3e20b1d2eb4","abstract_canon_sha256":"8d8af2dfe1177b4bfbebf640fe4d7d0eb6495d8e710c095289abe4ff4a16697f"},"schema_version":"1.0"},"canonical_sha256":"70e54963ccabe92ec99803364d8b481d941de3fca04ae3780d5172b78fe3ba50","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:51:19.972787Z","signature_b64":"vMwz8/YmUjLklIfOiMl6HTlU67nLhLHBy6GHmtpuwu6sOgB4m2Iw+lX0XwwbwNe2BhPVXeYCG+MY8Nlvn1wcAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"70e54963ccabe92ec99803364d8b481d941de3fca04ae3780d5172b78fe3ba50","last_reissued_at":"2026-07-05T00:51:19.972246Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:51:19.972246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.04146","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:51:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WE92OyNdOOJO5Fuj2Y8bigPKZ5n5MG+RS6yzD7CM79b9MMO72QF/fgbKvQLOi0fO3clmuw0VbpZa1GAqs0+KBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:02:20.860581Z"},"content_sha256":"3fc93ea58508cab22067fb1719092bfe7290231dea75caa1769d261ece833848","schema_version":"1.0","event_id":"sha256:3fc93ea58508cab22067fb1719092bfe7290231dea75caa1769d261ece833848"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:ODSUSY6MVPUS5SMYAM3E3C2IDW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Large, tunable valley splitting and single-spin relaxation mechanisms in a Si/Si$_x$Ge$_{1-x}$ quantum dot","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"cond-mat.mes-hall","authors_text":"Andreas Schmidbauer, Arne Hollmann, Dominique Bougeard, Floyd Schauer, Helge Riemann, Kentarou Sawano, Lars R. Schreiber, Nikolay V. Abrosimov, Tim Leonhardt, Tom Struck, Veit Langrock","submitted_at":"2019-07-09T13:23:39Z","abstract_excerpt":"Valley splitting is a key figure of silicon-based spin qubits. Quantum dots in Si/SiGe heterostructures reportedly suffer from a relatively low valley splitting, limiting the operation temperature and the scalability of such qubit devices. Here, we demonstrate a robust and large valley splitting exceeding 200 $\\mu$eV in a gate-defined single quantum dot, hosted in molecular-beam epitaxy-grown $^{28}$Si/SiGe. The valley splitting is monotonically and reproducibly tunable up to 15 % by gate voltages, originating from a 6 nm lateral displacement of the quantum dot. We observe static spin relaxati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.04146","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1907.04146/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:51:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X4EHTG9axNo3LyR+jxzzQImuPRt2ivRpeLC3bqlL4MDxGynAdwgxJE1quaoHVQ4J5QKIL/bKMqEA72K/uip7AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-07T11:02:20.860947Z"},"content_sha256":"5b14da34cd2bc89565740e5703513742b0ff8fd02470b2f5f6c1e205ca5c99fb","schema_version":"1.0","event_id":"sha256:5b14da34cd2bc89565740e5703513742b0ff8fd02470b2f5f6c1e205ca5c99fb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/bundle.json","state_url":"https://pith.science/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/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":"2026-07-07T11:02:20Z","links":{"resolver":"https://pith.science/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW","bundle":"https://pith.science/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/bundle.json","state":"https://pith.science/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ODSUSY6MVPUS5SMYAM3E3C2IDW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:ODSUSY6MVPUS5SMYAM3E3C2IDW","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":"8d8af2dfe1177b4bfbebf640fe4d7d0eb6495d8e710c095289abe4ff4a16697f","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-07-09T13:23:39Z","title_canon_sha256":"8eceaa3b387ffa9685c6d78de706ffe5d6a52cee0afc4e16ceb5a3e20b1d2eb4"},"schema_version":"1.0","source":{"id":"1907.04146","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.04146","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"arxiv_version","alias_value":"1907.04146v2","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.04146","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_12","alias_value":"ODSUSY6MVPUS","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_16","alias_value":"ODSUSY6MVPUS5SMY","created_at":"2026-07-05T00:51:19Z"},{"alias_kind":"pith_short_8","alias_value":"ODSUSY6M","created_at":"2026-07-05T00:51:19Z"}],"graph_snapshots":[{"event_id":"sha256:5b14da34cd2bc89565740e5703513742b0ff8fd02470b2f5f6c1e205ca5c99fb","target":"graph","created_at":"2026-07-05T00:51:19Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1907.04146/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Valley splitting is a key figure of silicon-based spin qubits. Quantum dots in Si/SiGe heterostructures reportedly suffer from a relatively low valley splitting, limiting the operation temperature and the scalability of such qubit devices. Here, we demonstrate a robust and large valley splitting exceeding 200 $\\mu$eV in a gate-defined single quantum dot, hosted in molecular-beam epitaxy-grown $^{28}$Si/SiGe. The valley splitting is monotonically and reproducibly tunable up to 15 % by gate voltages, originating from a 6 nm lateral displacement of the quantum dot. We observe static spin relaxati","authors_text":"Andreas Schmidbauer, Arne Hollmann, Dominique Bougeard, Floyd Schauer, Helge Riemann, Kentarou Sawano, Lars R. Schreiber, Nikolay V. Abrosimov, Tim Leonhardt, Tom Struck, Veit Langrock","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-07-09T13:23:39Z","title":"Large, tunable valley splitting and single-spin relaxation mechanisms in a Si/Si$_x$Ge$_{1-x}$ quantum dot"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.04146","kind":"arxiv","version":2},"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":"sha256:3fc93ea58508cab22067fb1719092bfe7290231dea75caa1769d261ece833848","target":"record","created_at":"2026-07-05T00:51:19Z","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":"8d8af2dfe1177b4bfbebf640fe4d7d0eb6495d8e710c095289abe4ff4a16697f","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-07-09T13:23:39Z","title_canon_sha256":"8eceaa3b387ffa9685c6d78de706ffe5d6a52cee0afc4e16ceb5a3e20b1d2eb4"},"schema_version":"1.0","source":{"id":"1907.04146","kind":"arxiv","version":2}},"canonical_sha256":"70e54963ccabe92ec99803364d8b481d941de3fca04ae3780d5172b78fe3ba50","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"70e54963ccabe92ec99803364d8b481d941de3fca04ae3780d5172b78fe3ba50","first_computed_at":"2026-07-05T00:51:19.972246Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:51:19.972246Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vMwz8/YmUjLklIfOiMl6HTlU67nLhLHBy6GHmtpuwu6sOgB4m2Iw+lX0XwwbwNe2BhPVXeYCG+MY8Nlvn1wcAw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:51:19.972787Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.04146","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3fc93ea58508cab22067fb1719092bfe7290231dea75caa1769d261ece833848","sha256:5b14da34cd2bc89565740e5703513742b0ff8fd02470b2f5f6c1e205ca5c99fb"],"state_sha256":"82dd3d32730427bfed62fa517093859f381488fcae3c91706ae72a3d2affe5c0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pszNBAC8iFICkAqegicW0CpQBcsa2zoDxqsbVoUmIeTmm5yi5IsDov826iv6Sa6H7l+nr4v1OgdklwADIQM2CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-07T11:02:20.862862Z","bundle_sha256":"537d61dd1131cf39fba879eee4fa40b34fc5a36f775bd7bd55ca11b2f9d7a650"}}