1. Center for Ultrafast Science and Technology, School of Physics and Astronomy, and School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Research Center for Functional Materials, International Institute for Materials Science, Tsukuba 305-0044, Japan
3. Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Japan
4. Department of Physics, Department of Chemistry and Biochemistry, Programs of Biophysics, Chemical Physics, and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States