{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:5HG5HK6XJISB7ADJM4GAOIH4AL","short_pith_number":"pith:5HG5HK6X","schema_version":"1.0","canonical_sha256":"e9cdd3abd74a241f8069670c0720fc02c91b17ce23b01a3723f9ea63f817d879","source":{"kind":"arxiv","id":"1901.00704","version":1},"attestation_state":"computed","paper":{"title":"First principles study of ferroelastic twins in halide perovskites","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrew R. Warwick, Jorge \\'I\\~niguez, Nicholas C. Bristowe, Peter D. Haynes","submitted_at":"2019-01-03T12:55:02Z","abstract_excerpt":"We present an ab initio simulation of $90^{\\circ}$ ferroelastic twins that were recently observed in methyl ammonium lead iodide. There are two inequivalent types of $90^{\\circ}$ walls that we calculate to act as either electron or hole sinks which suggests a possible route to enhancing charge carrier separation in photovoltaic devices. Despite separating non-polar domains, we show these walls to have a substantial in-plane polarisation of $\\sim 6 \\phantom{|} \\mu \\text{C}\\phantom{|}\\text{cm}^{-2}$, due in part to flexoelectricity. We suggest this in turn could allow for the photoferroic effect"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1901.00704","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2019-01-03T12:55:02Z","cross_cats_sorted":[],"title_canon_sha256":"5923aa7223cebbe0ff84a4d10df4047846749d97ef6d277f3ff607ef60ca7e82","abstract_canon_sha256":"390710a77a8da18fadde471748503aec7dd9ed36da13e374237164f23e03e318"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:25.728016Z","signature_b64":"edOzB0ioWsTGBP48SLlyOG8sS58gBD/t7LH1+hQGG39KdS22wFvN0YedOorXiUkvht5PClwa2qhR4IcTEp7kDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e9cdd3abd74a241f8069670c0720fc02c91b17ce23b01a3723f9ea63f817d879","last_reissued_at":"2026-05-17T23:51:25.727506Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:25.727506Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First principles study of ferroelastic twins in halide perovskites","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Andrew R. Warwick, Jorge \\'I\\~niguez, Nicholas C. Bristowe, Peter D. Haynes","submitted_at":"2019-01-03T12:55:02Z","abstract_excerpt":"We present an ab initio simulation of $90^{\\circ}$ ferroelastic twins that were recently observed in methyl ammonium lead iodide. There are two inequivalent types of $90^{\\circ}$ walls that we calculate to act as either electron or hole sinks which suggests a possible route to enhancing charge carrier separation in photovoltaic devices. Despite separating non-polar domains, we show these walls to have a substantial in-plane polarisation of $\\sim 6 \\phantom{|} \\mu \\text{C}\\phantom{|}\\text{cm}^{-2}$, due in part to flexoelectricity. We suggest this in turn could allow for the photoferroic effect"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.00704","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1901.00704","created_at":"2026-05-17T23:51:25.727582+00:00"},{"alias_kind":"arxiv_version","alias_value":"1901.00704v1","created_at":"2026-05-17T23:51:25.727582+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.00704","created_at":"2026-05-17T23:51:25.727582+00:00"},{"alias_kind":"pith_short_12","alias_value":"5HG5HK6XJISB","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_16","alias_value":"5HG5HK6XJISB7ADJ","created_at":"2026-05-18T12:33:10.108867+00:00"},{"alias_kind":"pith_short_8","alias_value":"5HG5HK6X","created_at":"2026-05-18T12:33:10.108867+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL","json":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL.json","graph_json":"https://pith.science/api/pith-number/5HG5HK6XJISB7ADJM4GAOIH4AL/graph.json","events_json":"https://pith.science/api/pith-number/5HG5HK6XJISB7ADJM4GAOIH4AL/events.json","paper":"https://pith.science/paper/5HG5HK6X"},"agent_actions":{"view_html":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL","download_json":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL.json","view_paper":"https://pith.science/paper/5HG5HK6X","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1901.00704&json=true","fetch_graph":"https://pith.science/api/pith-number/5HG5HK6XJISB7ADJM4GAOIH4AL/graph.json","fetch_events":"https://pith.science/api/pith-number/5HG5HK6XJISB7ADJM4GAOIH4AL/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL/action/storage_attestation","attest_author":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL/action/author_attestation","sign_citation":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL/action/citation_signature","submit_replication":"https://pith.science/pith/5HG5HK6XJISB7ADJM4GAOIH4AL/action/replication_record"}},"created_at":"2026-05-17T23:51:25.727582+00:00","updated_at":"2026-05-17T23:51:25.727582+00:00"}