The first and second authors acknowledge the support from the National Natural Science Foundation of China (4057016), National Outstanding Youth Natural Science Foundation of China (40325016), National Basic Research Program (Program 973; 2005CB422302), and FANEDD. The third author would also like to thank the support of the Missouri Research Board and U.S. Department of Energy. The authors express an appreciation to Dr. Lixin Wu for his comments on the original manuscript of this paper. The authors thank Dr. S. Feldstein and an anonymous reviewer for useful suggestions in improving this paper.
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