{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:GQJ7BKDXQHSJXGQE34OOJPTBVZ","short_pith_number":"pith:GQJ7BKDX","canonical_record":{"source":{"id":"2409.19726","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-09-29T14:54:17Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"6b0c89a905e6d5ac7c7de76d79a7c5eb5ea23fdff1a758d3393732203a5c4953","abstract_canon_sha256":"4223e1f5db8900911e05f1be476496f118fdcde13b31a42a63333367fef6d8f5"},"schema_version":"1.0"},"canonical_sha256":"3413f0a87781e49b9a04df1ce4be61ae57e6da5b4c56f7ea7d1c93284346d7d3","source":{"kind":"arxiv","id":"2409.19726","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2409.19726","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"arxiv_version","alias_value":"2409.19726v2","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2409.19726","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_12","alias_value":"GQJ7BKDXQHSJ","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_16","alias_value":"GQJ7BKDXQHSJXGQE","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_8","alias_value":"GQJ7BKDX","created_at":"2026-07-05T09:34:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:GQJ7BKDXQHSJXGQE34OOJPTBVZ","target":"record","payload":{"canonical_record":{"source":{"id":"2409.19726","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-09-29T14:54:17Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"6b0c89a905e6d5ac7c7de76d79a7c5eb5ea23fdff1a758d3393732203a5c4953","abstract_canon_sha256":"4223e1f5db8900911e05f1be476496f118fdcde13b31a42a63333367fef6d8f5"},"schema_version":"1.0"},"canonical_sha256":"3413f0a87781e49b9a04df1ce4be61ae57e6da5b4c56f7ea7d1c93284346d7d3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:34:57.976206Z","signature_b64":"hvq7xpnOE4egtdpVe8NFPaV4Ws3x0U4fBaXNsFY7OuSVQfnJzl6BUjeVhMscVO3rd4Nivg+bFp6lyeUMI9kgDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3413f0a87781e49b9a04df1ce4be61ae57e6da5b4c56f7ea7d1c93284346d7d3","last_reissued_at":"2026-07-05T09:34:57.975769Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:34:57.975769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2409.19726","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":"2026-07-05T09:34:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lQRMvoKqC8wTp17O/YwmbqvIbsrrrCn+/K2TYzKgGZublwtUFdFhQMX7A+3R3bR2rYBv1aPLZCZsH7UeAdueAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:10:05.273638Z"},"content_sha256":"c0da9cf99aba14e497cedd09408d9bde505a0dccf70e89f0f415911434a22767","schema_version":"1.0","event_id":"sha256:c0da9cf99aba14e497cedd09408d9bde505a0dccf70e89f0f415911434a22767"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:GQJ7BKDXQHSJXGQE34OOJPTBVZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"Amir Yacoby, Fangzhou Xia, Jixiang Yang, Junseok Seo, Kenji Watanabe, Lihan Shi, Long Ju, Seunghyun Park, Shenyong Ye, Takashi Taniguchi, Tonghang Han, Yuxuan Yao, Zhengguang Lu","submitted_at":"2024-09-29T14:54:17Z","abstract_excerpt":"Van der Waals heterostructures have emerged as a versatile platform to study correlated and topological electron physics. Spectroscopy experiments in the THz regime are crucial, since the energy of THz photons matches that of relevant excitations and charge dynamics. However, their micron-size and complex (dual-)gated structures have challenged such measurements. Here, we demonstrate on-chip THz spectroscopy on a dual-gated bilayer graphene device at liquid helium temperature. To avoid unwanted THz absorption by metallic gates, we developed a scheme of operation by combining semiconducting gat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2409.19726","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/2409.19726/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":"2026-07-05T09:34:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"09pcb4v9UtfW6cyYqlDiOp5e85AUo99v6G5QNf45Bmt9mp10Or1X1cBqDxO601K4hqgAcbFWj6m+iDj0DWqYDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:10:05.274144Z"},"content_sha256":"5925410119e894ed1ce55ecab6821bf5b6152b772a260720ab89b3a0dc85fa1e","schema_version":"1.0","event_id":"sha256:5925410119e894ed1ce55ecab6821bf5b6152b772a260720ab89b3a0dc85fa1e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/bundle.json","state_url":"https://pith.science/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/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":"2026-08-07T17:10:05Z","links":{"resolver":"https://pith.science/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ","bundle":"https://pith.science/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/bundle.json","state":"https://pith.science/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GQJ7BKDXQHSJXGQE34OOJPTBVZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:GQJ7BKDXQHSJXGQE34OOJPTBVZ","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":"4223e1f5db8900911e05f1be476496f118fdcde13b31a42a63333367fef6d8f5","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-09-29T14:54:17Z","title_canon_sha256":"6b0c89a905e6d5ac7c7de76d79a7c5eb5ea23fdff1a758d3393732203a5c4953"},"schema_version":"1.0","source":{"id":"2409.19726","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2409.19726","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"arxiv_version","alias_value":"2409.19726v2","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2409.19726","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_12","alias_value":"GQJ7BKDXQHSJ","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_16","alias_value":"GQJ7BKDXQHSJXGQE","created_at":"2026-07-05T09:34:57Z"},{"alias_kind":"pith_short_8","alias_value":"GQJ7BKDX","created_at":"2026-07-05T09:34:57Z"}],"graph_snapshots":[{"event_id":"sha256:5925410119e894ed1ce55ecab6821bf5b6152b772a260720ab89b3a0dc85fa1e","target":"graph","created_at":"2026-07-05T09:34:57Z","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/2409.19726/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Van der Waals heterostructures have emerged as a versatile platform to study correlated and topological electron physics. Spectroscopy experiments in the THz regime are crucial, since the energy of THz photons matches that of relevant excitations and charge dynamics. However, their micron-size and complex (dual-)gated structures have challenged such measurements. Here, we demonstrate on-chip THz spectroscopy on a dual-gated bilayer graphene device at liquid helium temperature. To avoid unwanted THz absorption by metallic gates, we developed a scheme of operation by combining semiconducting gat","authors_text":"Amir Yacoby, Fangzhou Xia, Jixiang Yang, Junseok Seo, Kenji Watanabe, Lihan Shi, Long Ju, Seunghyun Park, Shenyong Ye, Takashi Taniguchi, Tonghang Han, Yuxuan Yao, Zhengguang Lu","cross_cats":["cond-mat.mtrl-sci"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-09-29T14:54:17Z","title":"On-Chip Terahertz Spectroscopy for Dual-Gated van der Waals Heterostructures at Cryogenic Temperatures"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2409.19726","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:c0da9cf99aba14e497cedd09408d9bde505a0dccf70e89f0f415911434a22767","target":"record","created_at":"2026-07-05T09:34:57Z","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":"4223e1f5db8900911e05f1be476496f118fdcde13b31a42a63333367fef6d8f5","cross_cats_sorted":["cond-mat.mtrl-sci"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2024-09-29T14:54:17Z","title_canon_sha256":"6b0c89a905e6d5ac7c7de76d79a7c5eb5ea23fdff1a758d3393732203a5c4953"},"schema_version":"1.0","source":{"id":"2409.19726","kind":"arxiv","version":2}},"canonical_sha256":"3413f0a87781e49b9a04df1ce4be61ae57e6da5b4c56f7ea7d1c93284346d7d3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3413f0a87781e49b9a04df1ce4be61ae57e6da5b4c56f7ea7d1c93284346d7d3","first_computed_at":"2026-07-05T09:34:57.975769Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:34:57.975769Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hvq7xpnOE4egtdpVe8NFPaV4Ws3x0U4fBaXNsFY7OuSVQfnJzl6BUjeVhMscVO3rd4Nivg+bFp6lyeUMI9kgDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T09:34:57.976206Z","signed_message":"canonical_sha256_bytes"},"source_id":"2409.19726","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c0da9cf99aba14e497cedd09408d9bde505a0dccf70e89f0f415911434a22767","sha256:5925410119e894ed1ce55ecab6821bf5b6152b772a260720ab89b3a0dc85fa1e"],"state_sha256":"ffb7ccc8c991eebbbb046ed815c5de2671625fef3f2d1a6ed33b3435dee4aa52"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zgGbwKaIdsLM7+Fry/G57u0vghZfVIqS4+xL5vqgR/jitL28++23WDxgstOvhPWCyhwlC6yXuThnXGtDYPjSCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T17:10:05.278807Z","bundle_sha256":"659e8091d0aff4d0e96c8d21a6f02a95cb5f8e2a64694b5d2229d7025ca3e23b"}}