Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance

Details Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance

2006-09-09

arxiv.org/abs/cond-mat/0609219v3

Phys. Rev. A75, 013622(6) (2007)

Physics

Condensed Matter

Other Condensed Matter

Final version in PRA

Scientific paper

10.1103/PhysRevA.75.013622

We investigate the ground state properties of an equal mixture of two species of bosons in its Mott-insulator phase at a filling factor two per site. We identify one type of spin triplet-singlet transition through the competition of ground state. When the on-site interaction is weak ($UU_c$), higher band will be populated. Due to the orbital coupling term $S^+S^-$ in the Hamiltonian, the two atoms in different orbits on a site would form an on-site singlet. For a non-SU(2)-symmetric model, easy-axis or easy-plane ferromagnetic spin exchange models may be realized corresponding to phase separation or counter-flow superfluidity, respectively.

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