1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
2. National Laboratory of Solid State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
3. European Synchrotron Radiation Facility, ESRF, 38043 Grenoble Cedex 9, France
4. School of Physical Science and Technology, Ningbo University, Ningbo 315211, China