1. State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, People’s Republic of China.
2. Collaborative Innovation Center of Quantum Matter, Beijing 100084, People’s Republic of China.
3. Institute for Advanced Study, Tsinghua University, Beijing 100084, People’s Republic of China.
4. Stanford Center for Topological Quantum Physics, Stanford University, Stanford, CA 94305-4045, USA.
5. RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.