Phase separation in optical lattices in a spin-dependent external potential

Details Phase separation in optical lattices in a spin-dependent external potential Phase separation in optical lattices in a spin-dependent external potential

2010-03-02

arxiv.org/abs/1003.0532v1

Phys. Rev. A 81, 013628 (2010)

Physics

Condensed Matter

Quantum Gases

6 pages, 7 figures

Scientific paper

We investigate the phase separation in one-dimensional Fermi gases on optical lattices. The density distributions and the magnetization are calculated by means of density-matrix renormalization method. The phase separation between spin-up and spin-down atoms is induced by the interplay of the spin-dependent harmonic confinement and the strong repulsive interaction between intercomponent fermions. We find the existence of a critical repulsive interaction strength above which the phase separation evolves. By increasing the trap imbalance, the composite phase of Mott-insulating core is changed into the one of ferromagnetic insulating core, which is incompressible and originates from the Pauli exclusion principle.

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