Volume 79, Number 3, August 2007
|Number of page(s)||6|
|Published online||18 July 2007|
Paired state in an integrable spin-1 boson model
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100080, PRC
2 International Center for Quantum Structures, Chinese Academy of Sciences - Beijing 100080, PRC
Accepted: 20 June 2007
An exactly solvable model describing the low-density limit of the spin-1 bosons in a one-dimensional optical lattice is proposed. The exact Bethe ansatz solution shows that the low-energy physics of this system is described by a quantum liquid of spin singlet bound pairs. Motivated by the exact results, a mean-field approach to the corresponding three-dimensional system is carried out. Condensation of singlet pairs and coexistence with ordinary Bose-Einstein condensation are predicted.
PACS: 05.30.Jp – Boson systems / 03.75.Hh – Static properties of condensates; thermodynamical, statistical, and structural properties / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
© Europhysics Letters Association, 2007
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