We thank all the laboratory members for helpful discussion. This work was supported by grants from National Natural Science Foundation of China (No. 81270594), National Basic Research Program of China (No. 2012CB518000, No. 2013CB966800) and National Natural Science Foundation of China (No. 81070414). Jiansong Huang is a recipient of a fellowship from The China Postdoctoral Science Foundation (No. 2013M531185).
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