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Bad Metallic Transport in a Modified Hubbard Model
Connie H Mousatov1, Ilya Esterlis1, Sean A Hartnoll1
1Department of Physics, Stanford University, Stanford, California 94305, USA.
Physical Review Letters
|May 31, 2019
Summary
We present a new model for bad metals, revealing T-linear resistivity and violations of the Wiedemann-Franz law in strongly correlated materials. This research offers insights into anomalous transport phenomena.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Strongly correlated metals exhibit anomalous transport properties.
- T-linear resistivity above the Mott-Ioffe-Regel limit is a key characteristic.
Purpose of the Study:
- Introduce a tractable microscopic model for bad metals.
- Characterize electric, thermal, and thermoelectric transport in strongly correlated systems.
Main Methods:
- Modified the Hubbard model by incorporating a screened Coulomb interaction.
- Analyzed the electric, thermal, and thermoelectric transport properties.
Main Results:
- Observed T-linear resistivity above the Mott-Ioffe-Regel limit across the phase diagram.
- Demonstrated strong violation of the Wiedemann-Franz law.
- Found a large thermopower with potential sign changes.
Conclusions:
- The new model successfully captures anomalous transport in bad metals.
- The screened Coulomb interaction is crucial for understanding these phenomena.
- The findings have implications for designing novel electronic and thermoelectric materials.
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