The ground state of a mixture of two species of fermionic atoms in 1D optical lattice

Details The ground state of a mixture of two species of fermionic atoms in 1D optical lattice The ground state of a mixture of two species of fermionic atoms in 1D optical lattice

2006-01-23

arxiv.org/abs/cond-mat/0601496v2

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 10 figures, extended version

Scientific paper

10.1103/PhysRevB.76.125107

In this paper, we investigate the ground state properties of a mixture of two species of fermionic atoms in 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 on-going experiments on strongly correlated cold-atomic systems and traditional heavy fermion systems.

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