1. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
2. York-Nanjing Joint Centre (YNJC) for Spintronics and Nano Engineering, Department of Electronics, The University of York, YO10 3DD, United Kingdom
3. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
4. Department of Electronic Engineering, Royal Holloway University of London, Egham TW20 0EX, United Kingdom
5. Zhejiang Hikstor Technology Co., Ltd., Hangzhou 311305, China