1. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
2. Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
3. National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and School of Physics, Nanjing University, Nanjing 210093, China
4. College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China