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.
Received: 27 June 2003
Revised: 18 August 2003
Accepted manuscript online:
Fund: Project supported by the Natural Science Foundation of Henan Province and the National Natural Science Foundation of China (Grant Nos 60276004 and 60290083).
Cite this article:
Liu Zi-Xin (刘自信), Liu Ping (刘平), Liu Ya (刘亚), Wen Sheng-Hui (文生辉) The pairing correlations in the phased t－U Hubbard model 2004 Chinese Physics 13 229
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