Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices

Abstract

We study the effect of mass imbalance on the phase diagram of a two-component fermionic mixture with attractive interactions in optical lattices. Using static and dynamical mean-field theories, we show that the pure superfluid phase is stable for all couplings when the mass imbalance is smaller than a limiting value. For larger imbalance, phase separation between a superfluid and a charge-density wave takes place when the coupling exceeds a critical strength. The harmonic trap induces a spatial segregation of the two phases, with a rapid variation of the density at the boundary.

arXiv commente.g.:4 pages, 3 figures

References in corpus (15)

• The cold atom Hubbard toolbox
• Interior Gap Superfluidity
• Exact solution of the Falicov-Kimball model with dynamical mean-field theory
• Observation of Feshbach resonances between two different atomic species
• Interaction-induced adiabatic cooling and antiferromagnetism of cold fermions in optical lattices
• Two-species fermion mixtures with population imbalance
• Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model
• Simultaneous Diagonal and Off Diagonal Order in the Bose--Hubbard Hamiltonian
• Energetic balance of the superconducting transition across the BCS-Bose E instein crossover in the attractive Hubbard model
• Pairing and Superconductivity from weak to strong coupling in the Attractive Hubbard model
• First-Order Pairing Transition and Single-Particle Spectral Function in the Attractive Hubbard Model
• Effective Hamiltonian for fermions in an optical lattice across Feshbach resonance
• Spin-1/2 fermions on spin-dependent optical lattices
• Superfluid shells for trapped fermions with mass and population imbalance
• Potential-energy (BCS) to kinetic-energy (BEC)-driven pairing in the attractive Hubbard model

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• Mott transition of fermionic mixtures with mass imbalance in optical lattices
• Supersolid state in fermionic optical lattice systems
• Quantum Monte Carlo study of mass-imbalanced Hubbard models
• Advantages of Mass-Imbalanced Ultracold Fermionic Mixtures for Approaching Quantum Magnetism in Optical Lattices
• Low temperature properties of the fermionic mixtures with mass imbalance in optical lattice
• Inhomogeneous BCS-BEC crossover for trapped cold atoms in optical lattices
• Finite-density corrections to the Unitary Fermi gas: A lattice perspective from Dynamical Mean-Field Theory
• Frustrated Cooper pairing and the $f$-wave supersolidity
• Magnetic phases of mass- and population-imbalanced ultracold fermionic mixtures in optical lattices
• Phase diagram of the asymmetric Hubbard model and an entropic chromatographic method for cooling cold fermions in optical lattices
• Orbital selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
• Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
• Stability of superfluid phases in the 2D Spin-Polarized Attractive Hubbard Model
• Ground-state properties of fermionic mixtures with mass imbalance in optical lattices
• Spatially-modulated Superfluid States in Fermionic Optical Ladder Systems with Repulsive Interactions
• Mass-imbalance induced metal-insulator transition in a three-component Hubbard model
• Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice
• Collective excitations of an imbalanced fermion gas in a 1D optical lattice
• Monte Carlo study of fermionic trions in a square lattice with harmonic confinement
• Triplet pair amplitude in a trapped $s$-wave superfluid Fermi gas with broken spin rotation symmetry
• Interplay of mass imbalance and frustration in correlated band insulators