Exact results of the ground state and excitation properties of a two-component interacting Bose system
Zhejiang Institute of Modern Physics, Zhejiang
University Hangzhou 310027, PRC
2 Institute of Physics, University of Augsburg - 86135 Augsburg, Germany
Accepted: 19 November 2002
We study a one-dimensional Bose system with repulsive δ-function interaction in the presence of an SU(2) intrinsic degree of freedom on the basis of the coordinate Bethe ansatz. The ground state and the low-lying excitations are determined by both numerical and analytical methods. It is shown that the ground state is an isospin-ferromagnetic state, and the excitations are composed of three elementary particles: holons, antiholons, and isospinons. The isospinon is a triplet coupled to the “ferromagnetic” background anti-parallelly.
PACS: 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 03.65.Ge – Solutions of wave equations: bound states
© EDP Sciences, 2003