Magnetism and domain formation in SU(3)-symmetric multi-species Fermi mixtures

Abstract

We study the phase diagram of an SU(3)-symmetric mixture of three-component ultracold fermions with attractive interactions in an optical lattice, including the additional effect on the mixture of an effective three-body constraint induced by three-body losses. We address the properties of the system in $D\ge 2$ by using dynamical mean-field theory and variational Monte Carlo techniques. The phase diagram of the model shows a strong interplay between magnetism and superfluidity. In the absence of the three-body constraint (no losses), the system undergoes a phase transition from a color superfluid phase to a trionic phase, which shows additional particle density modulations at half-filling. Away from the particle-hole symmetric point the color superfluid phase is always spontaneously magnetized, leading to the formation of different color superfluid domains in systems where the total number of particles of each species is conserved. This can be seen as the SU(3) symmetric realization of a more general tendency to phase-separation in three-component Fermi mixtures. The three-body constraint strongly disfavors the trionic phase, stabilizing a (fully magnetized) color superfluid also at strong coupling. With increasing temperature we observe a transition to a non-magnetized SU(3) Fermi liquid phase.

36 pages, 17 figures; Corrected typos

References in corpus (20)

• Evidence for Superfluidity of Ultracold Fermions in an Optical Lattice
• Collisional stability of a three-component degenerate Fermi gas
• Degenerate Fermi Gases of Ytterbium
• Ultracold fermions and the SU(N) Hubbard model
• Exploring an ultracold Fermi-Fermi mixture: Interspecies Feshbach resonances and scattering properties of 6Li and 40K
• Three-body recombination in a three-state Fermi gas with widely tunable interactions
• Ultracold Gases of Ytterbium: Ferromagnetism and Mott States in an SU(6) Fermi System
• Atomic three-body loss as a dynamical three-body interaction
• Color Superfluidity and "Baryon" Formation in Ultracold Fermions
• Superfluidity and magnetism in multicomponent ultracold fermions
• BCS pairing in Fermi systems with several flavors
• Trionic phase of ultracold fermions in an optical lattice: A variational study
• Pairing in a three component Fermi gas
• Three-Component Fermi Gas in a one-dimensional Optical Lattice
• Functional renormalization for trion formation in ultracold fermion gases
• Competing superfluid and density-wave ground-states of fermionic mixtures with mass imbalance in optical lattices
• Polarized superfluidity in the attractive Hubbard model with population imbalance
• Three-Component Fermionic Atoms with Repulsive Interaction in Optical Lattices
• Polarized Superfluidity in the imbalanced attractive Hubbard model
• Exact diagonalization study of the trionic crossover and the trion liquid in the attractive three-component Hubbard model

Cited by in corpus (1)

• Trion and Dimer Formation of Three-Color Fermions