Mott-Hubbard transition in the mass-imbalanced Hubbard model

Abstract

The mass-imbalanced Hubbard model represents a continuous evolution from the Hubbard to the Falicov-Kimball model. We employ dynamical mean field theory and study the paramagnetic metal-insulator transition, which has a very different nature for the two limiting models. Our results indicate that the metal-insulator transition rather resembles that of the Hubbard model as soon as a tiny hopping between the more localized fermions is switched on. At low temperatures we observe a first-order metal-insulator transition and a three peak structure. The width of the central peak is the same for the more and less mobile fermions when approaching the phase transition, which agrees with our expectation of a common Kondo temperature and phase transition for the two species.

arXiv comment7 pages, 7 figures

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Cited by in corpus (9)

• Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
• Self-consistent ladder D$\Gamma$A approach
• Surmounting the sign problem in non-relativistic calculations: a case study with mass-imbalanced fermions
• Extended Falicov-Kimball model: Exact solution for finite temperatures
• Extended Falicov-Kimball model: exact solution for the ground state
• Orbital-selective thermalization plateau in the mass imbalanced Hubbard model
• Second-order dual fermion for multi-orbital systems
• Dynamical recovery of SU(2) symmetry in the mass-quenched Hubbard model
• Interplay of mass imbalance and frustration in correlated band insulators