Volume 79, Number 3, August 2007
Article Number 30005
Number of page(s) 6
Section General
Published online 18 July 2007
EPL, 79 (2007) 30005
DOI: 10.1209/0295-5075/79/30005

Paired state in an integrable spin-1 boson model

Junpeng Cao1, Yuzhu Jiang1 and Yupeng Wang1, 2

1  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

received 12 April 2007; accepted in final form 20 June 2007; published August 2007
published online 18 July 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.

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