| Issue |
Europhys. Lett.
Volume 61, Number 3, February 2003
|
|
|---|---|---|
| Page(s) | 368 - 374 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00183-2 | |
| Published online | 01 January 2003 | |
Exact results of the ground state and excitation properties of a two-component interacting Bose system
1
Zhejiang Institute of Modern Physics, Zhejiang
University Hangzhou 310027, PRC
2
Institute of Physics, University of Augsburg - 86135
Augsburg, Germany
Received:
23
September
2002
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
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