Phase diagram of imbalanced fermions in optical lattices

Details Phase diagram of imbalanced fermions in optical lattices Phase diagram of imbalanced fermions in optical lattices

2009-03-13

arxiv.org/abs/0903.2346v2

Phys. Rev. B 79, 180509(R) (2009)

Physics

Condensed Matter

Quantum Gases

5 pages, 4 figures, typos and references added

Scientific paper

10.1103/PhysRevB.79.180509

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.

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