1. Department of Physics, Key Laboratory for Computational Physical Science (Ministry of Education), State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
2. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, Jiangsu, China
3. Key Laboratory of Polar Materials and Devices (Ministry of Education), East China Normal University, Shanghai 200241, China
4. Beijing Computational Science Research Center, Beijing 100193, China