{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:PPDUFNCKVAVC3RD7EVXZN3GJKR","short_pith_number":"pith:PPDUFNCK","canonical_record":{"source":{"id":"2308.13484","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2023-08-25T16:47:12Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"f50648a653da35b6fba36c62bba337d079ccd446dcd4d70e70247173d3e28ad5","abstract_canon_sha256":"70bc2340b2dc96a2ff8a31e6e7ad2ef4b2788b8a599898db274730c4245af89b"},"schema_version":"1.0"},"canonical_sha256":"7bc742b44aa82a2dc47f256f96ecc954588f2b866da73e11e8c67b0d6c4f823b","source":{"kind":"arxiv","id":"2308.13484","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.13484","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"arxiv_version","alias_value":"2308.13484v1","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.13484","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_12","alias_value":"PPDUFNCKVAVC","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_16","alias_value":"PPDUFNCKVAVC3RD7","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_8","alias_value":"PPDUFNCK","created_at":"2026-07-05T07:20:10Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:PPDUFNCKVAVC3RD7EVXZN3GJKR","target":"record","payload":{"canonical_record":{"source":{"id":"2308.13484","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2023-08-25T16:47:12Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"f50648a653da35b6fba36c62bba337d079ccd446dcd4d70e70247173d3e28ad5","abstract_canon_sha256":"70bc2340b2dc96a2ff8a31e6e7ad2ef4b2788b8a599898db274730c4245af89b"},"schema_version":"1.0"},"canonical_sha256":"7bc742b44aa82a2dc47f256f96ecc954588f2b866da73e11e8c67b0d6c4f823b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:20:10.342342Z","signature_b64":"nLLohZJcCDJPYweaV0sxQAKhlxQUy9G9jXP0WHoVDRsq71iD0xAHCxM51fb9oCuAWrR9mpzse9y7GlHzpJuOCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7bc742b44aa82a2dc47f256f96ecc954588f2b866da73e11e8c67b0d6c4f823b","last_reissued_at":"2026-07-05T07:20:10.341869Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:20:10.341869Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2308.13484","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":"2026-07-05T07:20:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yhXaPqqmQ56tZSKoicCCoWyLMFRHtfmYkM3ZvBSP7aufRM1XU9rlSpVDfutN2GBLEP9YR8uRqCYvC3s3MdMWCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T19:39:32.181950Z"},"content_sha256":"30b2d5709550f1ef5c723dcb596fdadebfbbf0fbb17afac1e074904a77987d0b","schema_version":"1.0","event_id":"sha256:30b2d5709550f1ef5c723dcb596fdadebfbbf0fbb17afac1e074904a77987d0b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:PPDUFNCKVAVC3RD7EVXZN3GJKR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultra-clean assembly of van der Waals heterostructures","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"physics.app-ph","authors_text":"Alex Summerfield, Amy Carl, Andrew J. Strudwick, Andrey Kretinin, Astrid Weston, Cecilia Mattevi, Eli G. Castanon, Endre Tovari, Evan Tillotson, Francisco Selles, Haoyu Bai, Hugo De Latour, James Howarth, Kenji Watanabe, Leonid A. Ponomarenko, Matthew Hamer, Mingwei Zhou, Nicholas Clark, Paul V. Wiper, Roman Gorbachev, Sam Sullivan-Allsop, Sarah J. Haigh, Takashi Taniguchi, Thomas H. Bointon, Wendong Wang, Xiao Li, Yunze Gao","submitted_at":"2023-08-25T16:47:12Z","abstract_excerpt":"Layer-by-layer assembly of van der Waals (vdW) heterostructures underpins new discoveries in solid state physics, material science and chemistry. Despite the successes, all current 2D material (2DM) transfer techniques rely on the use of polymers which limit the cleanliness, ultimate electronic performance, and potential for optoelectronic applications of the heterostructures. In this article, we present a novel polymer-free platform for rapid and facile heterostructure assembly which utilises re-usable flexible silicon nitride membranes. We demonstrate that this allows fast and reproducible p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.13484","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2308.13484/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":"2026-07-05T07:20:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LfdoL+hr1IEJcHpUmQIeQNEeu40mC6mq7lqjeb281FP7Yj9NshrgaWEy8EIH+cl5ER22uB7XReI27njVgymODA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T19:39:32.182509Z"},"content_sha256":"f00d23ae746a5f57904460a0f26d861150e936ed18d5ca180d90b5279ebb5a7f","schema_version":"1.0","event_id":"sha256:f00d23ae746a5f57904460a0f26d861150e936ed18d5ca180d90b5279ebb5a7f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/bundle.json","state_url":"https://pith.science/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/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":"2026-08-18T19:39:32Z","links":{"resolver":"https://pith.science/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR","bundle":"https://pith.science/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/bundle.json","state":"https://pith.science/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PPDUFNCKVAVC3RD7EVXZN3GJKR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:PPDUFNCKVAVC3RD7EVXZN3GJKR","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":"70bc2340b2dc96a2ff8a31e6e7ad2ef4b2788b8a599898db274730c4245af89b","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2023-08-25T16:47:12Z","title_canon_sha256":"f50648a653da35b6fba36c62bba337d079ccd446dcd4d70e70247173d3e28ad5"},"schema_version":"1.0","source":{"id":"2308.13484","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2308.13484","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"arxiv_version","alias_value":"2308.13484v1","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2308.13484","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_12","alias_value":"PPDUFNCKVAVC","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_16","alias_value":"PPDUFNCKVAVC3RD7","created_at":"2026-07-05T07:20:10Z"},{"alias_kind":"pith_short_8","alias_value":"PPDUFNCK","created_at":"2026-07-05T07:20:10Z"}],"graph_snapshots":[{"event_id":"sha256:f00d23ae746a5f57904460a0f26d861150e936ed18d5ca180d90b5279ebb5a7f","target":"graph","created_at":"2026-07-05T07:20:10Z","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/2308.13484/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Layer-by-layer assembly of van der Waals (vdW) heterostructures underpins new discoveries in solid state physics, material science and chemistry. Despite the successes, all current 2D material (2DM) transfer techniques rely on the use of polymers which limit the cleanliness, ultimate electronic performance, and potential for optoelectronic applications of the heterostructures. In this article, we present a novel polymer-free platform for rapid and facile heterostructure assembly which utilises re-usable flexible silicon nitride membranes. We demonstrate that this allows fast and reproducible p","authors_text":"Alex Summerfield, Amy Carl, Andrew J. Strudwick, Andrey Kretinin, Astrid Weston, Cecilia Mattevi, Eli G. Castanon, Endre Tovari, Evan Tillotson, Francisco Selles, Haoyu Bai, Hugo De Latour, James Howarth, Kenji Watanabe, Leonid A. Ponomarenko, Matthew Hamer, Mingwei Zhou, Nicholas Clark, Paul V. Wiper, Roman Gorbachev, Sam Sullivan-Allsop, Sarah J. Haigh, Takashi Taniguchi, Thomas H. Bointon, Wendong Wang, Xiao Li, Yunze Gao","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2023-08-25T16:47:12Z","title":"Ultra-clean assembly of van der Waals heterostructures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2308.13484","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":"sha256:30b2d5709550f1ef5c723dcb596fdadebfbbf0fbb17afac1e074904a77987d0b","target":"record","created_at":"2026-07-05T07:20:10Z","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":"70bc2340b2dc96a2ff8a31e6e7ad2ef4b2788b8a599898db274730c4245af89b","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.app-ph","submitted_at":"2023-08-25T16:47:12Z","title_canon_sha256":"f50648a653da35b6fba36c62bba337d079ccd446dcd4d70e70247173d3e28ad5"},"schema_version":"1.0","source":{"id":"2308.13484","kind":"arxiv","version":1}},"canonical_sha256":"7bc742b44aa82a2dc47f256f96ecc954588f2b866da73e11e8c67b0d6c4f823b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7bc742b44aa82a2dc47f256f96ecc954588f2b866da73e11e8c67b0d6c4f823b","first_computed_at":"2026-07-05T07:20:10.341869Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:20:10.341869Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nLLohZJcCDJPYweaV0sxQAKhlxQUy9G9jXP0WHoVDRsq71iD0xAHCxM51fb9oCuAWrR9mpzse9y7GlHzpJuOCw==","signature_status":"signed_v1","signed_at":"2026-07-05T07:20:10.342342Z","signed_message":"canonical_sha256_bytes"},"source_id":"2308.13484","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:30b2d5709550f1ef5c723dcb596fdadebfbbf0fbb17afac1e074904a77987d0b","sha256:f00d23ae746a5f57904460a0f26d861150e936ed18d5ca180d90b5279ebb5a7f"],"state_sha256":"38ce5c8ed275e1895e837775df0c92d0b502c5322f87b4fb883ccf0c5de4418f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dm2RIoqCnZImnZwnu4ev90+wGJzdJ+r0bPDc0RJqy17zeT1CAIumUlgEsy1v/yVTydogPQCdYcpfWg8aWq4tDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T19:39:32.187513Z","bundle_sha256":"28e4d215eebd6d18dc8cdca8eaaa5930e783aefbe2d0727a16295b078ec8e4d4"}}