1. Key Lab of Organic Optoelectronics and Molecular Engineering; Department of Chemistry; Tsinghua University; Beijing 100084 China
2. State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
3. National Synchrotron Radiation Laboratory; CAS Center for Excellence in Nanoscience; University of Science and Technology of China; Hefei Anhui 230029 China
4. Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; Beijing 100190 China
5. School of Physical Sciences; University of Chinese Academy of Sciences; Beijing 100190 China
6. Collaborative Innovation Center of Quantum Matter; Beijing 100190 China