1. Department of Electronic Science and Engineering, Kyoto University, Kyotodaigakukatsura, Nishikyo-ku, Kyoto 615-8510, Japan
2. PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
3. Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210023, China
4. Department of Physics, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China
5. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an 710119, China