4.6 Article

Ground state of a mixture of two species of fermionic atoms in a one-dimensional optical lattice

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PHYSICAL REVIEW B
卷 76, 期 12, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.76.125107

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In this paper, we investigate the ground-state properties of a mixture of two species of fermionic atoms in a one-dimensional optical lattice, as described by the asymmetric Hubbard model. The quantum phase transition from density wave to phase separation is investigated by studying both the corresponding charge order parameter and quantum entanglement. A rigorous proof that even for the single-hole doping case, the density wave is unstable to the phase separation in the infinite U limit, is given. Therefore, our results are quite instructive for both ongoing experiments on strongly correlated cold-atomic systems and traditional heavy fermion systems.

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