The first and third authors acknowledge the support from the National Outstanding Youth Natural Science Foundation of China under Grant 40325016 and the National Natural Science Foundation of China (Grant 4057016), National Basic Research Program (Program 973) (2005CB422302), and FANEDD. The second author would also like to thank the support of the Missouri Research Board and U.S. Department of Energy. We are grateful to Dr. Yina Diao for her help during this study and also gratefully acknowledge discussions with Profs. Zhengyu Liu, Bin Wang, Lixin Wu, and Shanping Xie. The authors thank Dr. S. Feldstein and an anonymous reviewer for useful suggestions in improving this paper.
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