1. CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230023, Anhui, P. R. China
2. Hefei National Laboratory of Physical Science at the Microscale, Hefei 230026, P. R. China
3. Anhui Laboratory of Advanced Photon Science and Technology, Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, P. R. China
4. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, Guangdong, P. R. China