中国物理B ›› 1999, Vol. 8 ›› Issue (10): 776-782.doi: 10.1088/1004-423X/8/10/007
章豫梅1, 陈鸿1, 吴翔1, 石云龙2
Shi Yun-long (石云龙)ab, Zhang Yu-mei (章豫梅)a, Chen Hong (陈鸿)a, Wu Xiang (吴翔)a
摘要: The ground state and elementary excitations of the Peierls-Hubbard model are studied by using Gaussian wave functional method. The results show that the charge and spin degrees of freedom couple to each other due to the simultaneous existance of the dimerization and Hubbard repulsions. In the region of β2s>2π the spin gap ms is still present. Also the influence of Hubbard repulsions on the dimerization is derived from the critical behavior of ground state energy.
中图分类号: (Lattice fermion models (Hubbard model, etc.))