1. Center for Ultrafast Science and Technology, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
2. Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3. Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, China
4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
5. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
6. Physics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States