中国物理B ›› 2004, Vol. 13 ›› Issue (2): 229-233.doi: 10.1088/1009-1963/13/2/018

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The pairing correlations in the phased t－U Hubbard model

刘自信, 刘平, 刘亚, 文生辉   

  1. Department of Physics, Henan Normal University, Xinxiang 453002, China
  • 收稿日期:2003-06-27 修回日期:2003-08-18 出版日期:2004-02-06 发布日期:2005-07-06
  • 基金资助:
    Project supported by the Natural Science Foundation of Henan Province and the National Natural Science Foundation of China (Grant Nos 60276004 and 60290083).

The pairing correlations in the phased t－U Hubbard model

Liu Zi-Xin (刘自信), Liu Ping (刘平), Liu Ya (刘亚), Wen Sheng-Hui (文生辉)   

  1. Department of Physics, Henan Normal University, Xinxiang 453002, China
  • Received:2003-06-27 Revised:2003-08-18 Online:2004-02-06 Published:2005-07-06
  • Supported by:
    Project supported by the Natural Science Foundation of Henan Province and the National Natural Science Foundation of China (Grant Nos 60276004 and 60290083).

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摘要： In this paper we have studied the phased t－U Hubbard model. Using the constrained path Monte Carlo method, we investigated the effects of phase factor on pairing correlation functions in the ground state, and we found that the long-range correlations are dependent on the choice of phase factor, and for some special values of phase factor there exist long-range pairing correlations only in the strong coupling region.

关键词: Hubbard model, correlation function

Abstract: In this paper we have studied the phased t－U Hubbard model. Using the constrained path Monte Carlo method, we investigated the effects of phase factor on pairing correlation functions in the ground state, and we found that the long-range correlations are dependent on the choice of phase factor, and for some special values of phase factor there exist long-range pairing correlations only in the strong coupling region.

Key words: Hubbard model, correlation function

中图分类号:  (Lattice fermion models (Hubbard model, etc.))

  • 71.10.Fd
75.10.Dg (Crystal-field theory and spin Hamiltonians) 02.30.-f (Function theory, analysis) 02.70.Ss (Quantum Monte Carlo methods)