1. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), and Beijing National Laboratory for Molecular Sciences (BNLMS), Beijing 100190, China
2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621999, China
3. University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
4. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China
5. School of Physics and Electronics, Hunan University, Changsha 410022, China
6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
7. Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States