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

Liping Guo·Yunbo Zhang·Shu Chen
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Abstract

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 ($U U_c$), 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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Liping Guo, Yunbo Zhang, Shu Chen. 2007-01-29. Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance. https://doi.org/10.1103/physreva.75.013622

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