摘要
从标准Hubbard模型出发,对半充满Hubbard系统,采用Hubbard和Falicov Kimball近似处理,在讨论自旋为σ的电子运动时,忽略自旋为-σ的电子在格点间的跳跃,得到不对称哈密顿量,并运用平均场近似求得相应准粒子谱。在绝对零度和有限温度对结果作了分析,讨论了Mott金属-绝缘体相变的转变温度。
Starting from the standard Hubbard model, this paper obtained an asymmetric Hamiltonian for the half-filled strongly correlated system by ignoring the jumping of electrons with spin-σ between lattice sites when the motion of electrons with spin σ is considered. The mean field approximation is applied to get the quasi-particle spectrum of the Hamiltonian. The results at zero-temperature and finite temperature are analyzed,the possibility and critical temperature of Mott metal-insulator transition is also investigated.
出处
《华东船舶工业学院学报》
2004年第1期41-45,共5页
Journal of East China Shipbuilding Institute(Natural Science Edition)
基金
院青年基金项目(院编2001502)
