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

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dc.creatorGuo, Liping
dc.creatorZhang, Yunbo
dc.creatorChen, Shu
dc.date2006-09-09
dc.date2007-01-29
dc.date.accessioned2026-07-07T07:43:10Z
dc.date.available2026-07-07T07:43:10Z
dc.descriptionWe 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 ($U<U_c$) the two particles prefer to stay in the lowest band and with weak tunnelling between neighboring sites the system is mapped into an effective spin-1 ferromagnetic exchange Hamiltonian. When the interaction is tuned by a Feshbach resonance to be large enough ($U>U_c$), 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.
dc.descriptionFinal version in PRA
dc.identifierhttps://arxiv.org/abs/cond-mat/0609219
dc.identifierhttp://arxiv.org/abs/cond-mat/0609219
dc.identifierPhys. Rev. A75, 013622(6) (2007)
dc.identifierdoi:10.1103/PhysRevA.75.013622
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122722
dc.subjectOther Condensed Matter
dc.titleGround-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance
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