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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.01680 |
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| _version_ | 1866908287767674880 |
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| author | Roy, Sayantan Samanta, Abhisek Trivedi, Nandini |
| author_facet | Roy, Sayantan Samanta, Abhisek Trivedi, Nandini |
| contents | We investigate the doping-dependence of the Seebeck coefficient, as calculated from the Kelvin formula, for the Fermi Hubbard model using determinantal quantum Monte Carlo simulations. Our key findings are: (1) Besides the expected hole to electron-like behavior change around half filling, we show that the additional sign change at an electronic density $n_s$ (and correspondingly a hole density $p_s$) is controlled by the opening of a charge gap in the thermodynamic density of states or compressibility and not by the pseudogap scale in the single particle density of states. (2) We find that $n_s(T,U)$ depends strongly on the interaction $U$ and shows an unusual non-monotonic dependence on temperature with a maximum at a temperature $T\approx t$, on the order of the hopping scale. (3) We identify local moment formation close to half filling as the main driver for the anomalous behavior of the thermoelectric transport coefficient. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_01680 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sign changes of the thermoelectric transport coefficient across the metal-insulator crossover in the doped Fermi Hubbard model Roy, Sayantan Samanta, Abhisek Trivedi, Nandini Strongly Correlated Electrons Materials Science We investigate the doping-dependence of the Seebeck coefficient, as calculated from the Kelvin formula, for the Fermi Hubbard model using determinantal quantum Monte Carlo simulations. Our key findings are: (1) Besides the expected hole to electron-like behavior change around half filling, we show that the additional sign change at an electronic density $n_s$ (and correspondingly a hole density $p_s$) is controlled by the opening of a charge gap in the thermodynamic density of states or compressibility and not by the pseudogap scale in the single particle density of states. (2) We find that $n_s(T,U)$ depends strongly on the interaction $U$ and shows an unusual non-monotonic dependence on temperature with a maximum at a temperature $T\approx t$, on the order of the hopping scale. (3) We identify local moment formation close to half filling as the main driver for the anomalous behavior of the thermoelectric transport coefficient. |
| title | Sign changes of the thermoelectric transport coefficient across the metal-insulator crossover in the doped Fermi Hubbard model |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2407.01680 |