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Bad-Metal Behavior Reveals Mott Quantum Criticality in Doped Hubbard Models
J Vučičević1, D Tanasković1, M J Rozenberg2
1Scientific Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia.
Physical Review Letters
|July 22, 2015
Summary
Bad-metal behavior, a key signature of strong correlation, is linked to Mott quantum criticality. This study reveals scaling behavior in resistivity curves, offering quantitative insights into the Mott-Ioffe-Regel limit.
Area of Science:
- Condensed Matter Physics
- Strongly Correlated Electron Systems
Background:
- Bad-metal (BM) behavior, characterized by linear temperature-dependent resistivity above the Mott-Ioffe-Regel (MIR) limit, remains a significant unresolved issue in condensed matter physics.
- This behavior is often associated with strong electronic correlations, but a definitive theoretical explanation is lacking.
Purpose of the Study:
- To associate bad-metal behavior with Mott quantum criticality.
- To investigate the role of magnetic order suppression in understanding this phenomenon.
Main Methods:
- Utilized a fully frustrated Hubbard model, suppressing long-range magnetic orders.
- Employed dynamical mean-field theory (DMFT) for rigorous solutions of the Mott problem.
Main Results:
- Identified Mott quantum criticality across a broad phase diagram in the doped Mott insulator regime.
- Observed that the Mott metal-insulator transition and coexistence dome are restricted to very low temperatures.
- Discovered remarkable scaling behavior in resistivity curves, encompassing the entire BM regime.
Conclusions:
- Bad-metal behavior is quantitatively explained by Mott quantum criticality.
- The findings provide a new understanding of the MIR limit and its connection to quantum criticality.
- The results align with existing experimental observations, validating the theoretical approach.
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