1. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China
2. Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University, Guangzhou 510555, China
3. Key Lab of Si-based Information Materials & Devices and Integrated Circuits Design, Department of Education of Guangdong Province, Guangzhou 510006, China
4. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education International Center for Dielectric Research Xi’an Jiaotong University, Xi’an 710049, China
5. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
6. Hefei National Research Center for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China
7. Department of Chemistry and Chemical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA