1. Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
2. State Key Laboratory for Superhard Materials, Jilin University, Changchun, China 130012
3. Center for High Pressure Science and Technology Advanced Research, Changchun, China 130015
4. Center for the Study of Matter at Extreme Conditions, Florida International University, Miami, Florida 33199, United States