Low quasiparticle coherence temperature in the one- band Hubbard model: a slave-boson approach

Mezio, Alejandro and McKenzie, Ross H. (2017) Low quasiparticle coherence temperature in the one- band Hubbard model: a slave-boson approach. Physical Review B, 96 3: . doi:10.1103/PhysRevB.96.035121


Author Mezio, Alejandro
McKenzie, Ross H.
Title Low quasiparticle coherence temperature in the one- band Hubbard model: a slave-boson approach
Journal name Physical Review B   Check publisher's open access policy
ISSN 2469-9950
2469-9969
Publication date 2017-07-13
Year available 2017
Sub-type Article (original research)
DOI 10.1103/PhysRevB.96.035121
Open Access Status File (Publisher version)
Volume 96
Issue 3
Total pages 10
Place of publication College Park, MD United States
Publisher American Physical Society
Language eng
Formatted abstract
We use the Kotliar-Ruckenstein slave-boson formalism to study the temperature dependence of paramagnetic phases of the one-band Hubbard model for a variety of band structures. We calculate the Fermi liquid quasiparticle spectral weight
Z and identify the temperature at which it decreases significantly to a crossover to a bad metal region. Near the Mott metal-insulator transition, this coherence temperature  Tcoh is much lower than the Fermi temperature of the uncorrelated Fermi gas, as is observed in a broad range of strongly correlated electron materials. After a proper rescaling of temperature and interaction, we find a universal behavior that is independent of the band structure of the system. We obtain the temperature-interaction phase diagram as function of doping, and we compare the temperature dependence of the double occupancy, entropy, and charge compressibility with previous results obtained with dynamical mean-field theory. We analyze the stability of the method by calculating the charge compressibility.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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