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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.14225 |
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| _version_ | 1866913126699499520 |
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| author | Habitzreuter, M. A. da Silva, Willdauany C. de Freitas Fontenele, Rodrigo A. Costa, Natanael C. Paiva, Thereza |
| author_facet | Habitzreuter, M. A. da Silva, Willdauany C. de Freitas Fontenele, Rodrigo A. Costa, Natanael C. Paiva, Thereza |
| contents | 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 attractive interactions, nearest-neighbor interactions, sublattice potentials and electron-phonon coupling. 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 also show that the anomalous behavior is connected to a gap opening in the ground state. Moreover, electron-phonon coupling also lead to a Seebeck anomaly, even without on-site repulsion. We connect these changes of sign in the Seebeck coefficient with a restructuring of the Fermi surface and a change in its topology, an effect commonly seen in cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14225 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The thermopower properties of interacting systems Habitzreuter, M. A. da Silva, Willdauany C. de Freitas Fontenele, Rodrigo A. Costa, Natanael C. Paiva, Thereza Strongly Correlated Electrons 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 attractive interactions, nearest-neighbor interactions, sublattice potentials and electron-phonon coupling. 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 also show that the anomalous behavior is connected to a gap opening in the ground state. Moreover, electron-phonon coupling also lead to a Seebeck anomaly, even without on-site repulsion. We connect these changes of sign in the Seebeck coefficient with a restructuring of the Fermi surface and a change in its topology, an effect commonly seen in cuprates. |
| title | The thermopower properties of interacting systems |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2605.14225 |