{"paper":{"title":"Spinon shift current in a noncentrosymmetric quantum spin chain","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Spinons carry electric polarization that generates direct current under light in a noncentrosymmetric quantum spin chain.","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Ryosuke Yamashita, Shintaro Takayoshi, Takahiro Morimoto","submitted_at":"2026-04-17T13:40:24Z","abstract_excerpt":"We theoretically study direct current generation in a quantum spin chain induced by spinon excitations by light irradiation. We consider a s=1/2 1D antiferromagnetic XXZ model with magnetoelectric coupling that describes multiferroics with broken inversion symmetry. We perform the real-time simulation using infinite time-evolving block decimation (iTEBD), and demonstrate the direct current generation under light irradiation. By comparing the second order nonlinear conductivity and the two-spinon excitation spectra of 1D XXZ model, we confirm that the spinon excitations are the origin for the d"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We find that the bulk photovoltaic effect is driven by electric polarization carried by the spinons through the shift current mechanism, and thus is regarded as ``the spinon shift current''.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The magnetoelectric coupling term in the XXZ Hamiltonian accurately captures the electric polarization carried by spinons, and the iTEBD simulation faithfully reproduces the nonlinear optical response without finite-size or truncation artifacts.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Light-induced direct current in a noncentrosymmetric quantum spin chain is generated by spinon excitations via the shift current mechanism.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Spinons carry electric polarization that generates direct current under light in a noncentrosymmetric quantum spin chain.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"156562f944514774f3b5877724f555732d7181b48cc8d4823fb54a62c913cb55"},"source":{"id":"2604.16063","kind":"arxiv","version":2},"verdict":{"id":"55d34282-80b5-4298-849b-d41da71f118c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T07:38:35.520716Z","strongest_claim":"We find that the bulk photovoltaic effect is driven by electric polarization carried by the spinons through the shift current mechanism, and thus is regarded as ``the spinon shift current''.","one_line_summary":"Light-induced direct current in a noncentrosymmetric quantum spin chain is generated by spinon excitations via the shift current mechanism.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The magnetoelectric coupling term in the XXZ Hamiltonian accurately captures the electric polarization carried by spinons, and the iTEBD simulation faithfully reproduces the nonlinear optical response without finite-size or truncation artifacts.","pith_extraction_headline":"Spinons carry electric polarization that generates direct current under light in a noncentrosymmetric quantum spin chain."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.16063/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"}