Phase diagram of imbalanced fermions in optical lattices

Abstract

The zero-temperature phase diagrams of imbalanced fermions in 3D optical lattices are investigated to evaluate the validity of the Fermi-Hubbard model. It is found that depending on the filling factor, s-wave scattering strength and lattice potential, the system may fall into the normal($N$) phase, magnetized superfluid(SF${}_M$) or phase separation of $N$ and BCS state. By tuning these parameters, the superfluidity could be favorable by enhanced effective couplings or suppressed by the increased band gap. The phase profiles in the presence of a harmonic trap are also investigated under LDA, which show some exotic shell structures compared to those without the optical lattice.

arXiv comment5 pages, 4 figures, typos and references added

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Cited by in corpus (4)

• Spin-orbit coupled ultracold gases in optical lattices: High-band physics and insufficiency of tight-binding models
• Superfluidity of a spin-imbalanced Fermi gas in a three-dimensional optical lattice
• Polarized Fermi gases in asymmetric optical lattices
• Collective excitations of an imbalanced fermion gas in a 1D optical lattice