1. HPSynC, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
2. Center for High Pressure
Science and Technology Advanced Research, Shanghai 201203, China
3. London Centre for Nanotechnology, University College London, London, WC1H 0AH, United Kingdom
4. Research Complex at Harwell, Didcot, Oxfordshire OX11 0DE, United Kingdom
5. Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States