1. Institute
of Micro/Nano Devices and Solar Cells, School of Physics and Information
Engineering, Fuzhou University, Fuzhou 350108, Fujian, China
2. Department
of Physics, State Key Laboratory of Low Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
3. Jiangsu
Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu China
4. Key
Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
5. College
of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
6. School of
Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
7. CAS
Key Laboratory of Microscale Magnetic Resonance, Department of Modern
Physics, Synergetic Innovation Center of Quantum Information and Quantum
Physics, University of Science and Technology of China, Hefei 230026, China