Bad Metallic Transport in a Modified Hubbard Model
Strongly correlated metals often display anomalous transport, including T-linear resistivity above the Mott-Ioffe-Regel limit. We introduce a tractable microscopic model for bad metals, by restoring in the well-known Hubbard model—with hopping t and on-site repulsion U—a “screened Coulomb” interacti...
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| Published in: | Physical review letters Vol. 122; no. 18 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
United States
American Physical Society (APS)
10-05-2019
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Strongly correlated metals often display anomalous transport, including T-linear resistivity above the Mott-Ioffe-Regel limit. We introduce a tractable microscopic model for bad metals, by restoring in the well-known Hubbard model—with hopping t and on-site repulsion U—a “screened Coulomb” interaction between charge densities that decays exponentially with spatial separation. This interaction lifts the extensive degeneracy in the spectrum of the t = 0 Hubbard model, allowing us to fully characterize the small t electric, thermal, and thermoelectric transport in our strongly correlated model. Throughout the phase diagram we observe T-linear resistivity above the Mott-Ioffe-Regel limit, together with strong violation of the Wiedemann-Franz law and a large thermopower that can undergo sign change. |
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| Bibliography: | USDOE Office of Science (SC), Basic Energy Sciences (BES) AC02-76SF00515 |
| ISSN: | 0031-9007 1079-7114 |