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arXiv · 1003.0532

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

A-Hai Chen·Gao Xianlong
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Abstract

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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A-Hai Chen, Gao Xianlong. 2010-03-02. Phase separation in optical lattices in a spin-dependent external potential. https://doi.org/10.1103/physreva.81.013628

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