Acknowledgments
This study was supported by by the National Basic Research Program of China (973 Program; No. 2013CB932800), NSFC (No.
20972148), and CAS (No. KJCX2-EW-J02). We also thank the support of China Postdoctoral Science Foundation (Nos. 2011M500289,
2012T50078) Related theoretical study was supported by ChinaGrid project funded by MOE of China and Supercomputer Center of
USTC.
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