1. Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada
2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
3. Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
4. Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8, Canada