{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:H227Y6I5FWOT7JKCZMVN2TZP2R","short_pith_number":"pith:H227Y6I5","canonical_record":{"source":{"id":"1808.04647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-08-14T11:58:48Z","cross_cats_sorted":[],"title_canon_sha256":"c531aca8f285a8265ca3f7bf706b411ed819c78cf5bffb90b9fb2da8dc7f52bf","abstract_canon_sha256":"ec2ed3186f5b8e403c64f5014d0149236aa5109b2e85f2880f12142cc7daa8ec"},"schema_version":"1.0"},"canonical_sha256":"3eb5fc791d2d9d3fa542cb2add4f2fd44735fe45157686d33ab91cbdc8793448","source":{"kind":"arxiv","id":"1808.04647","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.04647","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"arxiv_version","alias_value":"1808.04647v1","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.04647","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"pith_short_12","alias_value":"H227Y6I5FWOT","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"H227Y6I5FWOT7JKC","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"H227Y6I5","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:H227Y6I5FWOT7JKCZMVN2TZP2R","target":"record","payload":{"canonical_record":{"source":{"id":"1808.04647","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-08-14T11:58:48Z","cross_cats_sorted":[],"title_canon_sha256":"c531aca8f285a8265ca3f7bf706b411ed819c78cf5bffb90b9fb2da8dc7f52bf","abstract_canon_sha256":"ec2ed3186f5b8e403c64f5014d0149236aa5109b2e85f2880f12142cc7daa8ec"},"schema_version":"1.0"},"canonical_sha256":"3eb5fc791d2d9d3fa542cb2add4f2fd44735fe45157686d33ab91cbdc8793448","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:06:37.020340Z","signature_b64":"Wb39hZezKy1wcrKlBX8dVl0wXqoPHCGMAh7FEFmorfcumitwYNeV5g6ngRtWaBO0ok4C+y/y6as6k/Ux5kKwCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3eb5fc791d2d9d3fa542cb2add4f2fd44735fe45157686d33ab91cbdc8793448","last_reissued_at":"2026-05-18T00:06:37.019978Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:06:37.019978Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1808.04647","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":"2026-05-18T00:06:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MQ9TCmuJPxJttEfxsG8rhkkKD+QeYuhDtDigsEnc+vv8cZfRV6jxEVTnfVI55NG64STIOBPE33PWbyN0XNdwAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T22:12:10.281970Z"},"content_sha256":"4c22edf280301324d09c2b75982bfa8b3840a2e4e1f3d7a8470b69828f9b5898","schema_version":"1.0","event_id":"sha256:4c22edf280301324d09c2b75982bfa8b3840a2e4e1f3d7a8470b69828f9b5898"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:H227Y6I5FWOT7JKCZMVN2TZP2R","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Topological negative refraction of surface acoustic waves in a Weyl phononic crystal","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Chunyin Qiu, Fan Zhang, Hailong He, Liping Ye, Manzhu Ke, Xiangxi Cai, Xiying Fan, Zhengyou Liu","submitted_at":"2018-08-14T11:58:48Z","abstract_excerpt":"Reflection and refraction occur at interface between two different media. These two fundamental phenomena form the basis of fabricating various wave components. Specifically, refraction, dubbed positive refraction nowadays, appears in the opposite side of the interface normal with respect to the incidence. Negative refraction, emerging in the same side by contrast, has been observed in artificial materials1-5 following a prediction by Veslago6, which has stimulated many fascinating applications such as super-resolution imaging7. Here we report the first discovery of negative refraction of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.04647","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":"2026-05-18T00:06:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1ZKhkokO4NsXOHlkkdzKW11IRwI3GesFWqHaLSutYfmVj0O5Zrow2IxaXBLRTk2CIQJrybrgmqnhYf+sYOPACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T22:12:10.282672Z"},"content_sha256":"c2f650e42ad629911a83c72d91f6cdfbfd9210623aa3b1595c793763ca4204f2","schema_version":"1.0","event_id":"sha256:c2f650e42ad629911a83c72d91f6cdfbfd9210623aa3b1595c793763ca4204f2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/bundle.json","state_url":"https://pith.science/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/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":"2026-05-27T22:12:10Z","links":{"resolver":"https://pith.science/pith/H227Y6I5FWOT7JKCZMVN2TZP2R","bundle":"https://pith.science/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/bundle.json","state":"https://pith.science/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H227Y6I5FWOT7JKCZMVN2TZP2R/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:H227Y6I5FWOT7JKCZMVN2TZP2R","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":"ec2ed3186f5b8e403c64f5014d0149236aa5109b2e85f2880f12142cc7daa8ec","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-08-14T11:58:48Z","title_canon_sha256":"c531aca8f285a8265ca3f7bf706b411ed819c78cf5bffb90b9fb2da8dc7f52bf"},"schema_version":"1.0","source":{"id":"1808.04647","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1808.04647","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"arxiv_version","alias_value":"1808.04647v1","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1808.04647","created_at":"2026-05-18T00:06:37Z"},{"alias_kind":"pith_short_12","alias_value":"H227Y6I5FWOT","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"H227Y6I5FWOT7JKC","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"H227Y6I5","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:c2f650e42ad629911a83c72d91f6cdfbfd9210623aa3b1595c793763ca4204f2","target":"graph","created_at":"2026-05-18T00:06:37Z","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":"Reflection and refraction occur at interface between two different media. These two fundamental phenomena form the basis of fabricating various wave components. Specifically, refraction, dubbed positive refraction nowadays, appears in the opposite side of the interface normal with respect to the incidence. Negative refraction, emerging in the same side by contrast, has been observed in artificial materials1-5 following a prediction by Veslago6, which has stimulated many fascinating applications such as super-resolution imaging7. Here we report the first discovery of negative refraction of the ","authors_text":"Chunyin Qiu, Fan Zhang, Hailong He, Liping Ye, Manzhu Ke, Xiangxi Cai, Xiying Fan, Zhengyou Liu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-08-14T11:58:48Z","title":"Topological negative refraction of surface acoustic waves in a Weyl phononic crystal"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1808.04647","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":"sha256:4c22edf280301324d09c2b75982bfa8b3840a2e4e1f3d7a8470b69828f9b5898","target":"record","created_at":"2026-05-18T00:06:37Z","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":"ec2ed3186f5b8e403c64f5014d0149236aa5109b2e85f2880f12142cc7daa8ec","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-08-14T11:58:48Z","title_canon_sha256":"c531aca8f285a8265ca3f7bf706b411ed819c78cf5bffb90b9fb2da8dc7f52bf"},"schema_version":"1.0","source":{"id":"1808.04647","kind":"arxiv","version":1}},"canonical_sha256":"3eb5fc791d2d9d3fa542cb2add4f2fd44735fe45157686d33ab91cbdc8793448","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3eb5fc791d2d9d3fa542cb2add4f2fd44735fe45157686d33ab91cbdc8793448","first_computed_at":"2026-05-18T00:06:37.019978Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:06:37.019978Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Wb39hZezKy1wcrKlBX8dVl0wXqoPHCGMAh7FEFmorfcumitwYNeV5g6ngRtWaBO0ok4C+y/y6as6k/Ux5kKwCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:06:37.020340Z","signed_message":"canonical_sha256_bytes"},"source_id":"1808.04647","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4c22edf280301324d09c2b75982bfa8b3840a2e4e1f3d7a8470b69828f9b5898","sha256:c2f650e42ad629911a83c72d91f6cdfbfd9210623aa3b1595c793763ca4204f2"],"state_sha256":"0151a3c98ff3fe6761e61f3004ce70204d79f9d9ccad6e36e55dcbe400417bee"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k2NUunXcDW8d16RUkwp7xFNWlQBF/J1JFrK/fao8tAlFH7Wt+CZUwOxF3Bfs/v0F/dzdMLHdoTSAPubpBeSNCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T22:12:10.285946Z","bundle_sha256":"0a18ebcd9dab237083a6c4c1c32f5890dd53484c78eb8afd6c17e623ae98d7d9"}}