1 State Key Laboratory of Information Photonics and Optical Communications and School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China. Electronic address: quheruge@bupt.edu.cn.
2 State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing 100871, China.
3 State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing 100871, China; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China; Beijing Key Laboratory for Magnetoelectric Materials and Devices (BKL-MEMD), Peking University, Beijing 100871, China; Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China; Peking University Yangtze Delta Institute of Optoelectronics, Nantong 226010, China. Electronic address: jinglu@pku.edu.cn.