1. State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 P. R. China
2. CAS Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular Science Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 P. R. China
3. Institute of High Energy Physics CAS Beijing 100049 P. R. China
4. Beijing National Laboratory for Condensed Matter Physics Institute of Physics CAS Beijing 100190 P. R. China