{"paper":{"title":"The thermopower properties of interacting systems","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"Additional interactions beyond on-site repulsion enhance the Seebeck coefficient and produce multiple anomalous sign changes with doping.","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"M. A. Habitzreuter, Natanael C. Costa, Rodrigo A. Fontenele, Thereza Paiva, Willdauany C. de Freitas da Silva","submitted_at":"2026-05-14T00:41:54Z","abstract_excerpt":"The quest for efficient devices has fueled research in thermoelectric materials. In these materials, the goal is to maximize the Figure of Merit $ZT$. One of the components of this quantity is the Seebeck coefficient, which measures the voltage generated in response to a temperature gradient. Recent studies have revealed that strong electronic correlations can enhance the Seebeck coefficient, leading to anomalous behavior near half-filling. However, the impact of interactions beyond the on-site Hubbard remains mostly unexplored. In this work, we investigate the Seebeck coefficient considering "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"We find that additional interaction scales can enhance the Seebeck coefficient, while also leading to multiple anomalous changes of sign as a function of doping. We connect these changes of sign in the Seebeck coefficient with a restructuring of the Fermi surface and a change in its topology.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The numerical or analytic method used to compute the Seebeck coefficient from the extended interacting Hamiltonians accurately captures the low-energy physics without uncontrolled approximations or finite-size artifacts.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Additional interaction terms enhance the Seebeck coefficient and produce multiple doping-dependent sign changes tied to gap opening and Fermi-surface topology changes.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Additional interactions beyond on-site repulsion enhance the Seebeck coefficient and produce multiple anomalous sign changes with doping.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"d2c50232d28a9a0e37e018aa001b6852132615363f0b40db4a85e41e239d8942"},"source":{"id":"2605.14225","kind":"arxiv","version":1},"verdict":{"id":"9f7cf549-bd8c-4606-b3f9-9dd968b4ca0f","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-15T02:41:00.448924Z","strongest_claim":"We find that additional interaction scales can enhance the Seebeck coefficient, while also leading to multiple anomalous changes of sign as a function of doping. We connect these changes of sign in the Seebeck coefficient with a restructuring of the Fermi surface and a change in its topology.","one_line_summary":"Additional interaction terms enhance the Seebeck coefficient and produce multiple doping-dependent sign changes tied to gap opening and Fermi-surface topology changes.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The numerical or analytic method used to compute the Seebeck coefficient from the extended interacting Hamiltonians accurately captures the low-energy physics without uncontrolled approximations or finite-size artifacts.","pith_extraction_headline":"Additional interactions beyond on-site repulsion enhance the Seebeck coefficient and produce multiple anomalous sign changes with doping."},"references":{"count":65,"sample":[{"doi":"","year":null,"title":"Around half-filling We now discuss the effects of near-neighbor interac- tions on the thermoelectric properties. To this end, we examine the extended Hubbard model (EHM) [32, 44], which describes ferm","work_id":"281b71d2-7470-4c3a-9d5f-a6d9d181fd66","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"3 and 4 show an additional sign change of the Seebeck coefficient near quarter-filling, which is robust forT /t≲1","work_id":"20bac829-b9d0-4424-bbc2-dd10bd523dbc","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Since the con- nection between density plateaus and entropy peaks was already highlighted in the previous Hamiltonians, here we show only the Seebeck coefficient in Figure 9","work_id":"7464dc9c-f37e-471d-8d2b-92aa32a7da77","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"Around quarter-filling We now turn our attention to the quarter-filling regime, in which the ground state is less clear. Figure 9 (a) shows that, as ∆ increases for fixedU/t= 10, the Seebeck response ","work_id":"e75c6f63-318c-45b0-8a0c-ad0121940137","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2005,"title":"D. M. Rowe,Thermoelectrics handbook: macro to nano (CRC press, 2005)","work_id":"29e3c499-4f16-41b7-87ce-603a47ded388","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":65,"snapshot_sha256":"4e184b6f33c187212e4dc3861c06bc12e2925a4329808f111989359a4f38f05d","internal_anchors":1},"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"}