[1
]Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory
of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, National
Synchrotron Radiation Laboratory, Department of Chemical Physics, University of Science
and Technology of China, Hefei, Anhui 230026, P. R. China
[2
]Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese
Academy of Sciences, Shanghai 201204, P. R. China