1. International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
2. Department of Physics, Brooklyn College of the City University of New York, Brooklyn, New York 11210, USA
3. Ph.D. Programs in Chemistry and Physics, The Graduate Center of the City University of New York, New York, New York 10016, USA
4. Collaborative Innovation Center of Quantum Matter, Beijing, China