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
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.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 05.70.-a – Thermodynamics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
