Funding for this research was provided by:
Natural Science Foundation of Anhui Province (1708085QC70)
the President Foundation of Hefei Institutes of Physical Science of Chinese Academy of Sciences (YZJJ201619)
the key program of 13th five-year plan (No. kp-2017-21)
the Science and Technology Service program of Chinese Academy of Sciences (KFJ-STS-ZDTP-002)
National Natural Science Foundation of China (31500531)
Received: 6 April 2018
Accepted: 18 May 2018
First Online: 30 May 2018
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