1. Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2. MIIT Key Laboratory of Advanced Display Materials and Devices, Institute of Optoelectronics and Nanomaterials, College of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
3. National Research Council Institute of Photonics and Nanotechnologies, Padova 35131, Italy
4. Department of Electronic Engineering, Royal Holloway University of London, Egham TW20 0EX, United Kingdom
5. Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
6. York-Nanjing Joint Center in Spintronics, Department of Electronic Engineering, The University of York, York YO10 5DD, United Kingdom