1. Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Department of Physics, Renmin University of China, Beijing 100872, People’s Republic of China
2. CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Centre for Excellence in Nanoscience, National Centre for Nanoscience and Technology, Beijing 100190, People’s Republic of China
3. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, P.R. China
4. College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210046, China
5. State Key Laboratory of Digital Manufacturing Equipment and Technology, Department of Instrument Science and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
6. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan