1. Shanghai Branch, Department of Modern Physics and National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Shanghai 201315, China
2. CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3. State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, School of Physics, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
4. Technische Physik, Physikalisches Institüt and Wilhelm Conrad Röntgen-Center for Complex Material Systems, Universitat Würzburg, Am Hubland, D-97074 Würzburg, Germany
5. Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310027, China
6. SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
7. Hearne Institute for Theoretical Physics and Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, United States
8. NYU-ECNU Institute for Physics at NYU Shanghai, Shanghai 200062, China