1. Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China
2. School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China
3. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China