基金Supported in part by the National Natural Science Foundation of China （10575119）, the Knowledge Innovation Project（KJCX3-SYW- N2） of Chinese Academy of Sciences, and the Major State Basic Research Developing Program of China （2007CB815004）.
1JIAO Zhi-Yong Department of Applied Physics,China University of Petroleum(East China),Dongying 257061,ChinaYU Zhao-Xian Department of Physics,Beijing Information Science and Technology University,Beijing 100101,ChinaWANG Ji-Suo Department of Physics,Liaocheng University,Liaocheng 252059,China.Amplitude Squeezing of a Weakly Interacting Bose System with Spontaneous U(1) Symmetry Breaking[J].Communications in Theoretical Physics,2007(12):1047-1050.
