{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:CXXHJ7WGEKLTN4MRQUKY6QC4VW","short_pith_number":"pith:CXXHJ7WG","canonical_record":{"source":{"id":"cond-mat/0210168","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"cond-mat.str-el","submitted_at":"2002-10-08T14:26:01Z","cross_cats_sorted":["nucl-th","physics.plasm-ph"],"title_canon_sha256":"422e3c68f804ff26da6a5f23e5f3fa149cb220de52bd4e4f07ba9e0dea1a4e82","abstract_canon_sha256":"4d76fd188d6815385c017f9ee1c1d49110fa9cb7601e0794db3ca782eb2f4249"},"schema_version":"1.0"},"canonical_sha256":"15ee74fec6229736f19185158f405cada29c12a485308652f7628047490c6ad2","source":{"kind":"arxiv","id":"cond-mat/0210168","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0210168","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0210168v3","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0210168","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"pith_short_12","alias_value":"CXXHJ7WGEKLT","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"CXXHJ7WGEKLTN4MR","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"CXXHJ7WG","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:CXXHJ7WGEKLTN4MRQUKY6QC4VW","target":"record","payload":{"canonical_record":{"source":{"id":"cond-mat/0210168","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"cond-mat.str-el","submitted_at":"2002-10-08T14:26:01Z","cross_cats_sorted":["nucl-th","physics.plasm-ph"],"title_canon_sha256":"422e3c68f804ff26da6a5f23e5f3fa149cb220de52bd4e4f07ba9e0dea1a4e82","abstract_canon_sha256":"4d76fd188d6815385c017f9ee1c1d49110fa9cb7601e0794db3ca782eb2f4249"},"schema_version":"1.0"},"canonical_sha256":"15ee74fec6229736f19185158f405cada29c12a485308652f7628047490c6ad2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:33:05.601023Z","signature_b64":"XaRUZOEIB/1y8De7pqUyX2h+9UF2MCaG+88Y43B3u9l3AgICw9Zv/JWpg5xBz+0yAFt8zWFTcRLL+mAUQsH7Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15ee74fec6229736f19185158f405cada29c12a485308652f7628047490c6ad2","last_reissued_at":"2026-05-18T04:33:05.600305Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:33:05.600305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"cond-mat/0210168","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:33:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EHNDlFG6jl6aIPTBfrrqA5gSs878o9EvrvFKLCTTwE7kGZZdjqygkDTUmBheTt0D+lFwQuUAhPzvwMrMp6N2DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T09:53:06.187869Z"},"content_sha256":"df93fa60d84be320549464c74fb1402fefa91b2f021936cef61994eeaf864677","schema_version":"1.0","event_id":"sha256:df93fa60d84be320549464c74fb1402fefa91b2f021936cef61994eeaf864677"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:CXXHJ7WGEKLTN4MRQUKY6QC4VW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Effective mass in quasi two-dimensional systems","license":"","headline":"","cross_cats":["nucl-th","physics.plasm-ph"],"primary_cat":"cond-mat.str-el","authors_text":"Klaus Morawetz","submitted_at":"2002-10-08T14:26:01Z","abstract_excerpt":"The effective mass of the quasiparticle excitations in quasi two-dimensional systems is calculated analytically. It is shown that the effective mass increases sharply when the density approaches the critical one of metal-insulator transition. This suggests a Mott type of transition rather than an Anderson like transition."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0210168","kind":"arxiv","version":3},"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":"2026-05-18T04:33:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8V6qxupJ6zqE6MOZ1ZSJFCRBjUjSl1DnMZM3uk6JifLjzEgwZVyZQ8usKkR5VyjD9V7Pkaw3/yTdqh7hkSH9BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T09:53:06.188209Z"},"content_sha256":"fc1bada3fc3fba3b45ede794edcfc712597a1f7e357839935bcd175e9e6238a5","schema_version":"1.0","event_id":"sha256:fc1bada3fc3fba3b45ede794edcfc712597a1f7e357839935bcd175e9e6238a5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/bundle.json","state_url":"https://pith.science/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/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":"2026-06-23T09:53:06Z","links":{"resolver":"https://pith.science/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW","bundle":"https://pith.science/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/bundle.json","state":"https://pith.science/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CXXHJ7WGEKLTN4MRQUKY6QC4VW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:CXXHJ7WGEKLTN4MRQUKY6QC4VW","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":"4d76fd188d6815385c017f9ee1c1d49110fa9cb7601e0794db3ca782eb2f4249","cross_cats_sorted":["nucl-th","physics.plasm-ph"],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"2002-10-08T14:26:01Z","title_canon_sha256":"422e3c68f804ff26da6a5f23e5f3fa149cb220de52bd4e4f07ba9e0dea1a4e82"},"schema_version":"1.0","source":{"id":"cond-mat/0210168","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"cond-mat/0210168","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"arxiv_version","alias_value":"cond-mat/0210168v3","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.cond-mat/0210168","created_at":"2026-05-18T04:33:05Z"},{"alias_kind":"pith_short_12","alias_value":"CXXHJ7WGEKLT","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"CXXHJ7WGEKLTN4MR","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"CXXHJ7WG","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:fc1bada3fc3fba3b45ede794edcfc712597a1f7e357839935bcd175e9e6238a5","target":"graph","created_at":"2026-05-18T04:33:05Z","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":"The effective mass of the quasiparticle excitations in quasi two-dimensional systems is calculated analytically. It is shown that the effective mass increases sharply when the density approaches the critical one of metal-insulator transition. This suggests a Mott type of transition rather than an Anderson like transition.","authors_text":"Klaus Morawetz","cross_cats":["nucl-th","physics.plasm-ph"],"headline":"","license":"","primary_cat":"cond-mat.str-el","submitted_at":"2002-10-08T14:26:01Z","title":"Effective mass in quasi two-dimensional systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0210168","kind":"arxiv","version":3},"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:df93fa60d84be320549464c74fb1402fefa91b2f021936cef61994eeaf864677","target":"record","created_at":"2026-05-18T04:33:05Z","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":"4d76fd188d6815385c017f9ee1c1d49110fa9cb7601e0794db3ca782eb2f4249","cross_cats_sorted":["nucl-th","physics.plasm-ph"],"license":"","primary_cat":"cond-mat.str-el","submitted_at":"2002-10-08T14:26:01Z","title_canon_sha256":"422e3c68f804ff26da6a5f23e5f3fa149cb220de52bd4e4f07ba9e0dea1a4e82"},"schema_version":"1.0","source":{"id":"cond-mat/0210168","kind":"arxiv","version":3}},"canonical_sha256":"15ee74fec6229736f19185158f405cada29c12a485308652f7628047490c6ad2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"15ee74fec6229736f19185158f405cada29c12a485308652f7628047490c6ad2","first_computed_at":"2026-05-18T04:33:05.600305Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:33:05.600305Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XaRUZOEIB/1y8De7pqUyX2h+9UF2MCaG+88Y43B3u9l3AgICw9Zv/JWpg5xBz+0yAFt8zWFTcRLL+mAUQsH7Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:33:05.601023Z","signed_message":"canonical_sha256_bytes"},"source_id":"cond-mat/0210168","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:df93fa60d84be320549464c74fb1402fefa91b2f021936cef61994eeaf864677","sha256:fc1bada3fc3fba3b45ede794edcfc712597a1f7e357839935bcd175e9e6238a5"],"state_sha256":"37dda62318f2981d24297c998fc81e0a16766b4964f0915089de56a3bd52e823"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"//F+FoaAq42ZJcLY1VcTJdvgGxDp/9avd2aQIFSiVxhEKCVbJeJYRY+J2A9eujcT5KABb37JKHvV/5d6dtTeDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T09:53:06.190131Z","bundle_sha256":"11378da45bcce7c7d17325bc3a326a576fd8d608d493265c6b3cac7efecc4143"}}