1. Department of Physics and Astronomy, University of California, Riverside, Riverside, CA 92521, USA.
2. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
3. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
4. Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
5. Department of Physics, The Pennsylvania State University, University Park, PA 16802, USA.
6. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Ibaraki, Japan.
7. Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Miyagi, Japan.
8. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
9. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.