Advantages of Mass-Imbalanced Ultracold Fermionic Mixtures for Approaching Quantum Magnetism in Optical Lattices

Abstract

We study magnetic phases of two-component mixtures of ultracold fermions with repulsive interactions in optical lattices in the presence of hopping imbalance. Our analysis is based on dynamical mean-field theory (DMFT) and its real-space generalization at finite temperature. We study the temperature dependence of the transition into the ordered state as a function of the interaction strength and the imbalance parameter in two and three spatial dimensions. We show that below the critical temperature for Néel order mass-imbalanced mixtures also exhibit a charge-density wave, which provides a directly observable signature of the ordered state. For the trapped system, we compare our results obtained by real-space DMFT to a local-density approximation. We calculate the entropy for a wide range of parameters and identify regions, in which mass-imbalanced mixtures could have clear advantages over balanced ones for the purpose of obtaining and detecting quantum magnetism.

5 pages, 4 figures

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Cited by in corpus (18)

• Nonthermal symmetry broken states in the strongly interacting Hubbard model
• Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture
• Magnetic ordering of three-component ultracold fermionic mixtures in optical lattices
• Cooling through quantum criticality and many-body effects in condensed matter and cold gases
• Critical entropies and magnetic-phase-diagram analysis of ultracold three-component fermionic mixtures in optical lattices
• Quantum Monte Carlo study of mass-imbalanced Hubbard models
• Realization of a Cold Mixture of Fermionic Chromium and Lithium Atoms
• Magnetic, thermodynamic, and dynamical properties of the three-dimensional fermionic Hubbard model: A comprehensive Monte Carlo study
• Magnetic phases of mass- and population-imbalanced ultracold fermionic mixtures in optical lattices
• Breaking of SU(4) symmetry and interplay between strongly correlated phases in the Hubbard model
• Double-degenerate Fermi mixtures of ${}^6$Li and ${}^{53}$Cr atoms
• Mott-Hubbard transition in the mass-imbalanced Hubbard model
• Mass-Imbalanced Ionic Hubbard Chain
• Complex phases in the doped two-species bosonic Hubbard Model
• Perspectives of optical lattices with state-dependent tunneling in approaching quantum magnetism in the presence of the external harmonic trapping potential
• Anisotropy-driven magnetic phase transitions in SU(4)-symmetric Fermi gas in three-dimensional optical lattices
• Interplay of mass imbalance and frustration in correlated band insulators
• Ferromagnetic phase in the polarized two-species bosonic Hubbard Model