[2] W.Z. acknowledges support from the Natural Science Foundation of China (51622211) and the CAS Key Research Program of Frontier Sciences. This research was also sponsored by the U.S. Department of Energy, by the McMinn Endowment, and by the Singapore National Research Foundation under NRF RF Award No. NRF-RF2013-08, Tier 2 MOE2016-T2-2-153 and MOE2015-T2-2-007.
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