1. State Key Laboratory for Mesoscopic Physics and Department of PhysicsPeking University Beijing 100871 P. R. China
2. Key Laboratory for the Physics and Chemistry of Nanodevices and Department of ElectronicsPeking University Beijing 100871 P. R. China
3. State Key Laboratory of Information Photonics and Optical Communications and School of ScienceBeijing University of Posts and Telecommunications Beijing 100876 P. R. China
4. School of Physics and Electronic Information EngineeringEngineering Research Center of Nanostructure and Functional MaterialsNingxia Normal University Guyuan Ningxia 756000 P. R. China
5. Collaborative Innovation Center of Quantum Matter Beijing 100871 P. R. China
6. Beijing Key Laboratory for Magnetoeletric Materials and Devices (BKL‐MEMD) Beijing 100871 P. R. China
7. School of Advanced MaterialsPeking UniversityShenzhen Graduate School Shenzhen 518055 China