1. State
Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
3. High Pressure
Synergetic Consortium (HPSynC), Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
4. College
of Physics, Jilin University, Changchun 130012, China