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This work was supported by grants from The National Natural Science Foundation of China (81272298, 30871282, 30871365, 81172189 and 81171930), The Hunan Province Natural Sciences Foundation of China (10JJ7003), The Fok Ying Tong Education Foundation (121036), The Fundamental Research Funds for The Central Universities (2011JQ020), The Mittal Innovative Entrepreneurial Project of Central South University (11MX27) and The Open-End Fund for the Valuable and Precision Instruments of Central South University