Eur. Phys. J. B 40, 191-200 (2004)
DOI: 10.1140/epjb/e2004-00257-y

Some exact results for one-dimensional two-band SU(2) bosons

Q.-L. Zhang, S.-J. Gu and Y.-Q. Li

Zhejiang Institute of Modern Physics, Department of Physics, Zhejiang University, Hangzhou 310027, P.R. China

qlzhang@hbar.zju.edu.cn

(Received 14 March 2004 / Published online 12 August 2004 )

Abstract
A one-dimensional model for two-band SU(2) bosons with isospin exchange interaction is solved by means of the nested Bethe-ansatz method. The features of the ground state and low-lying excitation state are discussed explicitly by numerical and analytical method. The thermodynamics of the system is analyzed by means of the thermodynamic Bethe-ansatz method, and some physical quantities, such as magnetization, specific heat, etc. are obtained explicitly in some special cases.

PACS
03.65.-w - Quantum mechanics.
72.15.Nj - Collective modes (e.g., in one-dimensional conductors).
03.65.Ge - Solutions of wave equations: bound states.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2004

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