中国物理B ›› 1999, Vol. 8 ›› Issue (10): 776-782.doi: 10.1088/1004-423X/8/10/007

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GROUND STATE AND ELEMENTARY EXCITATIONS OF THE PEIERLS-HUBBARD MODEL

章豫梅1, 陈鸿1, 吴翔1, 石云龙2   

  1. (1)Department of Physics, Tongji University, Shanghai 200092, China; (2)Department of Physics, Tongji University, Shanghai 200092, China; Department of Physics, Yanbei Normal Institute, Datong 037000, China
  • 收稿日期:1999-01-16 出版日期:1999-12-25 发布日期:2005-08-06
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grnat No. 19574040) and the Natural Science Foundation of Shanxi Province (Grant No. 971008), the Foundation for Young-Leaders of Disciplines in Science from Education Commission of Sh

GROUND STATE AND ELEMENTARY EXCITATIONS OF THE PEIERLS-HUBBARD MODEL

Shi Yun-long (石云龙)ab, Zhang Yu-mei (章豫梅)a, Chen Hong (陈鸿)a, Wu Xiang (吴翔)a   

  1. a Department of Physics, Tongji University, Shanghai 200092, China; b Department of Physics, Yanbei Normal Institute, Datong 037000, China
  • Received:1999-01-16 Online:1999-12-25 Published:2005-08-06
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grnat No. 19574040) and the Natural Science Foundation of Shanxi Province (Grant No. 971008), the Foundation for Young-Leaders of Disciplines in Science from Education Commission of Sh

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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.

Abstract: 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 $\beta$2s>2$\pi$ 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.))

  • 71.10.Fd
71.45.Lr (Charge-density-wave systems)