Exact results of the ground state and excitation properties of a two-component interacting Bose system

Details Exact results of the ground state and excitation properties of a two-component interacting Bose system Exact results of the ground state and excitation properties of a two-component interacting Bose system

2002-11-21

arxiv.org/abs/cond-mat/0211484v2

Europhys. Lett. 61, 368-374 (2003)

Physics

Condensed Matter

Statistical Mechanics

7 pages, incl. 3 figures, accepted by Europhys. Lett. (19 Nov 2002); added Comment (only!): EPL style version of cond-mat/0107

Scientific paper

10.1209/epl/i2003-00183-2

We study a one-dimensional Bose system with repulsive delta-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.

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