Phase diagram of imbalanced strongly interacting fermions on a one-dimensional optical lattice

Abstract

We show that the Hubbard Hamiltonian with particle-assisted tunneling rates --recently proposed to model a fermionic mixture near a broad Feshbach resonance-- displays a ground state phase diagram with superfluid, insulating, and phase separated regimes. In the latter case, when the populations are balanced the two phases coexist in microscopic antiferromagnetic domains. Macroscopic phase segregation into a high-density superfluid of molecules, and a low-density Fermi liquid of single atoms appears in the density profile above a critical polarization p_c.

4 pages, 3 figures

References in corpus (5)

• Molecules of Fermionic Atoms in an Optical Lattice
• Feshbach-Einstein condensates
• Mott insulator to superfluid transition of ultracold bosons in an optical lattice near a Feshbach resonance
• Nanoscale phase separation and superconductivity in the one-dimensional Hirsch model
• Suppression or enhancement of the Fulde-Ferrell-Larkin-Ovchinnikov order in a one-dimensional optical lattice with particle correlated tunnelling