Eur. Phys. J. B 33, 147-152 (2003)
https://doi.org/10.1140/epjb/e2003-00151-2

Low temperature properties of one-dimensional SU(4) Hubbard-like model at low concentration

¹ Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, 310027, PR China
² Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, 310027, PR China and Institute for Physics, Augsburg University, 86135 Augsburg, Germany
³ Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou, 310027, PR China

Corresponding author: ^a sjgu@zimp.zju.edu.cn

Received: 3 August 2002
Revised: 17 January 2003
Published online: 4 June 2003

Abstract

On the basis of Bethe ansatz solution of the one dimensional SU(4) Hubbard-like model, we have studied its thermodynamic properties by means of the Yang-Yang thermodynamic Bethe ansatz. The Landé g factors for both spin and orbit are taken into account so as to describe electrons with orbital degeneracy. The free energy at low temperature is given and the specific heat both in the strong coupling and weak coupling limits are obtained. At the same time, we also point out the three possible critical fields, which may cause a quantum phase transition.