{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:6YKLPLYLZGLQ76WW4GYVUPC5BG","short_pith_number":"pith:6YKLPLYL","canonical_record":{"source":{"id":"2105.13439","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-05-27T20:26:48Z","cross_cats_sorted":[],"title_canon_sha256":"2d39f0d0b36e7c6c94eac143651f0c185167fe95146fa208732836e4494b8e87","abstract_canon_sha256":"6466e0c00609c04d9a34da68ccc322bfbfa5131369f89524a05d534933e02157"},"schema_version":"1.0"},"canonical_sha256":"f614b7af0bc9970ffad6e1b15a3c5d098d358c1750e8dff140d3dc60414d604b","source":{"kind":"arxiv","id":"2105.13439","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.13439","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"arxiv_version","alias_value":"2105.13439v1","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.13439","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_12","alias_value":"6YKLPLYLZGLQ","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_16","alias_value":"6YKLPLYLZGLQ76WW","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_8","alias_value":"6YKLPLYL","created_at":"2026-07-05T03:19:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:6YKLPLYLZGLQ76WW4GYVUPC5BG","target":"record","payload":{"canonical_record":{"source":{"id":"2105.13439","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-05-27T20:26:48Z","cross_cats_sorted":[],"title_canon_sha256":"2d39f0d0b36e7c6c94eac143651f0c185167fe95146fa208732836e4494b8e87","abstract_canon_sha256":"6466e0c00609c04d9a34da68ccc322bfbfa5131369f89524a05d534933e02157"},"schema_version":"1.0"},"canonical_sha256":"f614b7af0bc9970ffad6e1b15a3c5d098d358c1750e8dff140d3dc60414d604b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:19:12.646632Z","signature_b64":"TPlglLSbuMDbaXNH3BTZ4dy5cAK4mwF8t2xhcfSsxt1CPFmVJgja/exVn2Txyj0MnZKACzfm+gD6MmVEjSH2CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f614b7af0bc9970ffad6e1b15a3c5d098d358c1750e8dff140d3dc60414d604b","last_reissued_at":"2026-07-05T03:19:12.646130Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:19:12.646130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.13439","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":"2026-07-05T03:19:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HFbDmaXKVvmRa+AOeehmtldLlqdYQRYW2xa8P1/qK+DrGQVvOczC7ic46twnD+1lmCAEGcCfGwS5pDIk0DjXDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T11:06:25.318698Z"},"content_sha256":"b9ac1ce240bc346d3c8fe7b6b2fa6e1a06f9984702ff3f35c1de7e4fe689f767","schema_version":"1.0","event_id":"sha256:b9ac1ce240bc346d3c8fe7b6b2fa6e1a06f9984702ff3f35c1de7e4fe689f767"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:6YKLPLYLZGLQ76WW4GYVUPC5BG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Direct Visualization of Gigahertz Acoustic Wave Propagation in Suspended Phononic Circuits","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Daehun Lee, Keji Lai, Lu Zheng, Mo Li, Qiyu Liu, Xuejian Ma","submitted_at":"2021-05-27T20:26:48Z","abstract_excerpt":"We report direct visualization of gigahertz-frequency Lamb waves propagation in aluminum nitride phononic circuits by transmission-mode microwave impedance microscopy (TMIM). Consistent with the finite-element modeling, the acoustic eigenmodes in both a horn-shaped coupler and a sub-wavelength waveguide are revealed in the TMIM images. Using fast Fourier transform filtering, we quantitatively analyze the acoustic loss of individual Lamb modes along the waveguide and the power coupling coefficient between the waveguide and the parabolic couplers. Our work provides insightful information on the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.13439","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/2105.13439/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":"2026-07-05T03:19:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8oOjuaEZOJ5Y4snFaYHYhsPlqFnAVPG0OC02JPuFJR167Snz8EgXn3AH89fPnGjk7MA2+dEddUmXXVgFq/V+Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T11:06:25.319290Z"},"content_sha256":"7a9db519e466e6c437b672787b76e13fcc9271320d2d51fbd7fa5de3bd8489a0","schema_version":"1.0","event_id":"sha256:7a9db519e466e6c437b672787b76e13fcc9271320d2d51fbd7fa5de3bd8489a0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/bundle.json","state_url":"https://pith.science/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/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":"2026-08-01T11:06:25Z","links":{"resolver":"https://pith.science/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG","bundle":"https://pith.science/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/bundle.json","state":"https://pith.science/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6YKLPLYLZGLQ76WW4GYVUPC5BG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:6YKLPLYLZGLQ76WW4GYVUPC5BG","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":"6466e0c00609c04d9a34da68ccc322bfbfa5131369f89524a05d534933e02157","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-05-27T20:26:48Z","title_canon_sha256":"2d39f0d0b36e7c6c94eac143651f0c185167fe95146fa208732836e4494b8e87"},"schema_version":"1.0","source":{"id":"2105.13439","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.13439","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"arxiv_version","alias_value":"2105.13439v1","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.13439","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_12","alias_value":"6YKLPLYLZGLQ","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_16","alias_value":"6YKLPLYLZGLQ76WW","created_at":"2026-07-05T03:19:12Z"},{"alias_kind":"pith_short_8","alias_value":"6YKLPLYL","created_at":"2026-07-05T03:19:12Z"}],"graph_snapshots":[{"event_id":"sha256:7a9db519e466e6c437b672787b76e13fcc9271320d2d51fbd7fa5de3bd8489a0","target":"graph","created_at":"2026-07-05T03:19:12Z","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/2105.13439/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report direct visualization of gigahertz-frequency Lamb waves propagation in aluminum nitride phononic circuits by transmission-mode microwave impedance microscopy (TMIM). Consistent with the finite-element modeling, the acoustic eigenmodes in both a horn-shaped coupler and a sub-wavelength waveguide are revealed in the TMIM images. Using fast Fourier transform filtering, we quantitatively analyze the acoustic loss of individual Lamb modes along the waveguide and the power coupling coefficient between the waveguide and the parabolic couplers. Our work provides insightful information on the ","authors_text":"Daehun Lee, Keji Lai, Lu Zheng, Mo Li, Qiyu Liu, Xuejian Ma","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-05-27T20:26:48Z","title":"Direct Visualization of Gigahertz Acoustic Wave Propagation in Suspended Phononic Circuits"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.13439","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:b9ac1ce240bc346d3c8fe7b6b2fa6e1a06f9984702ff3f35c1de7e4fe689f767","target":"record","created_at":"2026-07-05T03:19:12Z","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":"6466e0c00609c04d9a34da68ccc322bfbfa5131369f89524a05d534933e02157","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2021-05-27T20:26:48Z","title_canon_sha256":"2d39f0d0b36e7c6c94eac143651f0c185167fe95146fa208732836e4494b8e87"},"schema_version":"1.0","source":{"id":"2105.13439","kind":"arxiv","version":1}},"canonical_sha256":"f614b7af0bc9970ffad6e1b15a3c5d098d358c1750e8dff140d3dc60414d604b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f614b7af0bc9970ffad6e1b15a3c5d098d358c1750e8dff140d3dc60414d604b","first_computed_at":"2026-07-05T03:19:12.646130Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:19:12.646130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TPlglLSbuMDbaXNH3BTZ4dy5cAK4mwF8t2xhcfSsxt1CPFmVJgja/exVn2Txyj0MnZKACzfm+gD6MmVEjSH2CA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:19:12.646632Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.13439","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b9ac1ce240bc346d3c8fe7b6b2fa6e1a06f9984702ff3f35c1de7e4fe689f767","sha256:7a9db519e466e6c437b672787b76e13fcc9271320d2d51fbd7fa5de3bd8489a0"],"state_sha256":"938be84e382c5692f77e757a740ae15876c0bd14849f43bcabfaaa9d0dac4e7a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oBUxRPn4iuVwIJUIEWmgPH5T4l4C5O3f819RN+fMQe2AQqO+nT264rhFpjTxXW6olspuBITmTsDuKjMAojXGBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T11:06:25.324337Z","bundle_sha256":"59b6c686f459bf51ebacb88b203a6ef5bbc487857a890fd56bd626a3f3202a01"}}